Quarterly report pursuant to Section 13 or 15(d)

Capital Transactions (Details)

v2.4.0.6
Capital Transactions (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 1 Months Ended 3 Months Ended 6 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
May 31, 2012
Jun. 30, 2012
Jun. 30, 2012
Jun. 30, 2012
Stock options
Dec. 31, 2011
Stock options
Jun. 30, 2012
Stock options
Minimum
Jun. 30, 2012
Stock options
Maximum
Jun. 30, 2012
Time-based stock options
Jun. 30, 2011
Time-based stock options
Jun. 30, 2012
Time-based stock options
Jun. 30, 2011
Time-based stock options
Dec. 31, 2011
Time-based stock options
Jun. 30, 2012
Time-based stock options
Maximum
Jun. 30, 2012
Performance based stock options
Jun. 30, 2011
Performance based stock options
Jun. 30, 2012
Performance based stock options
Jun. 30, 2011
Performance based stock options
Dec. 31, 2011
Performance based stock options
Dividends [Abstract]                                    
Cash Dividend per common share (in dollars per share) $ 0.05 $ 0.05 $ 0.05                              
Dividend paid $ 780                                  
Number of shares                                    
Options outstanding at the beginning of the period (in shares)       1,374                            
Granted (in shares)       217                            
Expired (in shares)       (6)                            
Exercised (in shares)       (40)                            
Options outstanding at the end of the period (in shares)       1,545                            
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)       $ 15.65                            
Expired (in dollars per share)       $ 8.59                            
Exercised (in dollars per share)       $ 10.07                            
Options outstanding at the end of the period (in dollars per share)       $ 10.69                            
Share-based compensation, additional disclosures                                    
Weighted-average grant date fair value (in dollars per share)       $ 7.66                            
Expiration period       10 years                            
Weighted-average assumptions used to calculate fair value of options granted                                    
Expected life (in years)       4 years                            
Risk-free interest rate (as a percent)           0.30% 0.40%                      
Expected volatility (as a percent)           63.20% 66.00%                      
Dividend yield (as a percent)       0.00%                            
Share-based compensation, related information                                    
Vesting period                         36 months          
Operating income margin, one (as a percent)                               6.00%    
Operating income margin, two (as a percent)                               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    
Share-based compensation expense               356 136 669 224     329 920 652 920  
Related tax benefits               142 54 267 88     127 370 255 370  
Unrecognized share-based compensation expense               1,500   1,500   607   0   0   652
Expense expected to be recognized over a weighted-average period                   2 years                
Exercisable (in shares)       1,129 772                          
Expected to vest (net of expected forfeitures) (in shares)       392 602                          
Aggregate Intrinsic value, outstanding       6,943 7,757                          
Aggregate Intrinsic value, exercisable       5,797 4,819                          
Aggregate Intrinsic value, expected to vest       $ 1,077 $ 2,732