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Capital Transactions (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified |
1 Months Ended | 3 Months Ended | 9 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 9 Months Ended | 9 Months Ended | 12 Months Ended | |||||||||||||||
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Aug. 31, 2012
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May 31, 2012
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Sep. 30, 2012
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Sep. 30, 2012
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Sep. 30, 2012
Stock options
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Dec. 31, 2011
Stock options
|
Sep. 30, 2012
Stock options
Minimum
|
Sep. 30, 2012
Stock options
Maximum
|
Sep. 30, 2012
Time-based stock options
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Sep. 30, 2011
Time-based stock options
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Sep. 30, 2012
Time-based stock options
|
Sep. 30, 2011
Time-based stock options
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Dec. 31, 2011
Time-based stock options
|
Sep. 30, 2012
Time-based stock options
Maximum
|
Sep. 30, 2012
Operating income performance-based stock options
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Sep. 30, 2011
Operating income performance-based stock options
|
Sep. 30, 2012
Operating income performance-based stock options
|
Sep. 30, 2011
Operating income performance-based stock options
|
Dec. 31, 2011
Operating income performance-based stock options
|
Sep. 30, 2012
Net sales revenue performance-based stock options
|
Sep. 30, 2012
Net sales revenue performance-based stock options
Minimum
|
Sep. 30, 2012
Net sales revenue performance-based stock options
Maximum
|
Sep. 30, 2012
Restricted stock unit
|
Sep. 30, 2012
Restricted stock unit
|
Sep. 30, 2012
2009 Incentive Plan
Maximum
|
Sep. 30, 2012
2009 Incentive Plan
Stock options
|
Sep. 30, 2012
2009 Incentive Plan
Time-based stock options
|
Sep. 30, 2012
2012 Incentive Plan
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Sep. 30, 2012
2012 Incentive Plan
Stock options
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Dec. 31, 1995
1995 Stock Plan
Maximum
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| Dividends [Abstract] | ||||||||||||||||||||||||||||||
| Cash Dividend per common share (in dollars per share) | $ 0.05 | $ 0.05 | $ 0.05 | $ 0.10 | ||||||||||||||||||||||||||
| Dividend paid | $ 780 | $ 780 | ||||||||||||||||||||||||||||
| Share-based Compensation | ||||||||||||||||||||||||||||||
| Number of shares authorized | 400 | 1,500 | ||||||||||||||||||||||||||||
| Expiration period | 10 years | 10 years | 10 years | |||||||||||||||||||||||||||
| Number of shares | ||||||||||||||||||||||||||||||
| Options outstanding at the beginning of the period (in shares) | 1,374 | |||||||||||||||||||||||||||||
| Granted (in shares) | 681 | 217 | 464 | |||||||||||||||||||||||||||
| Expired (in shares) | (6) | |||||||||||||||||||||||||||||
| Exercised (in shares) | (191) | |||||||||||||||||||||||||||||
| Options outstanding at the end of the period (in shares) | 1,858 | |||||||||||||||||||||||||||||
| Weighted Average Exercise Price Per Share | ||||||||||||||||||||||||||||||
| Options outstanding at the beginning of the period (in dollars per share) | $ 9.88 | |||||||||||||||||||||||||||||
| Granted (in dollars per share) | $ 15.11 | $ 15.65 | $ 14.86 | |||||||||||||||||||||||||||
| Expired (in dollars per share) | $ 8.59 | |||||||||||||||||||||||||||||
| Exercised (in dollars per share) | $ 10.34 | |||||||||||||||||||||||||||||
| Options outstanding at the end of the period (in dollars per share) | $ 11.75 | |||||||||||||||||||||||||||||
| Share-based compensation, additional disclosures | ||||||||||||||||||||||||||||||
| Vesting period | 48 months | 1 year | ||||||||||||||||||||||||||||
| Operating income margin, one (as a percent) | 6.00% | |||||||||||||||||||||||||||||
| Operating income margin, two (as a percent) | 8.00% | 8.00% | ||||||||||||||||||||||||||||
| Operating income margin, three (as a percent) | 10.00% | |||||||||||||||||||||||||||||
| Period of time during which operating income margins must be achieved in order to vest in performance based stock options | 12 months | |||||||||||||||||||||||||||||
| Consecutive period of time used to assess operating income margins which determine vesting | 15 months | |||||||||||||||||||||||||||||
| Period of cumulative net sales revenue growth | 2 years | |||||||||||||||||||||||||||||
| Weighted-average grant date fair value (in dollars per share) | $ 7.66 | $ 7.01 | ||||||||||||||||||||||||||||
| Weighted-average assumptions used to calculate fair value of options granted | ||||||||||||||||||||||||||||||
| Expected life | 4 years | 6 years | ||||||||||||||||||||||||||||
| Risk-free interest rate (as a percent) | 0.30% | 0.90% | ||||||||||||||||||||||||||||
| Expected volatility (as a percent) | 58.50% | 66.00% | ||||||||||||||||||||||||||||
| Dividend yield (as a percent) | 0.00% | 1.30% | ||||||||||||||||||||||||||||
| Share-based compensation, related information | ||||||||||||||||||||||||||||||
| Share-based compensation expense | 630 | 166 | 1,299 | 390 | 0 | 607 | 652 | 1,527 | 50 | 50 | ||||||||||||||||||||
| Related tax benefits | 246 | 66 | 513 | 156 | 0 | 240 | 255 | 603 | 20 | 20 | ||||||||||||||||||||
| Unrecognized share-based compensation expense | 3,285 | 3,285 | 607 | 0 | 0 | 652 | 173 | 173 | ||||||||||||||||||||||
| Expense expected to be recognized over a weighted-average period | 1 year 10 months 24 days | 8 months 12 days | ||||||||||||||||||||||||||||
| Potential share-based compensation expense. | 700 | |||||||||||||||||||||||||||||
| Exercisable (in shares) | 1,061 | 772 | ||||||||||||||||||||||||||||
| Expected to vest (net of expected forfeitures) (in shares) | 660 | 602 | ||||||||||||||||||||||||||||
| Aggregate Intrinsic value, outstanding | 8,367 | 7,757 | ||||||||||||||||||||||||||||
| Aggregate Intrinsic value, exercisable | 7,213 | 4,819 | ||||||||||||||||||||||||||||
| Aggregate Intrinsic value, expected to vest | $ 1,085 | $ 2,732 | ||||||||||||||||||||||||||||
| Number of Shares | ||||||||||||||||||||||||||||||
| Granted (in shares) | 18 | |||||||||||||||||||||||||||||
| Units outstanding at the end of the period (in shares) | 18 | 18 | ||||||||||||||||||||||||||||
| Weighted Average Grant Date Fair Value | ||||||||||||||||||||||||||||||
| Granted (in dollars per share) | $ 12.07 | |||||||||||||||||||||||||||||
| Units outstanding at the end of the period (in dollars per share) | $ 12.07 | $ 12.07 | ||||||||||||||||||||||||||||