Quarterly report pursuant to Section 13 or 15(d)

Capital Transactions (Details 3)

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Capital Transactions (Details 3) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Employee Stock Option [Member]
         
Share Based Compensation          
Outstanding options to purchase (in shares) 2,144   2,144   1,926
Exercisable (in shares) 1,096   1,096   838
Expected to vest (in shares) 869   869   905
Aggregate Intrinsic value, outstanding $ 8,975   $ 8,975   $ 9,415
Aggregate Intrinsic value, exercisable 6,498   6,498   6,069
Aggregate Intrinsic value, expected to vest 2,353   2,353   3,179
Restricted Stock Units (RSUs) [Member]
         
Share-based compensation, additional disclosures          
Share-based compensation expense 269 52 466 127  
Related tax benefits 106 18 184 44  
Unrecognized share-based compensation expense $ 1,533   $ 1,533   $ 62
Weighted-average period over which the remaining compensation expense is expected to be recognized     2 years 1 month 6 days    
Incentive Plan 2012 [Member] | Restricted Stock Units (RSUs) [Member]
         
Number of Shares          
Units outstanding at the beginning of the period (in shares)     32    
Granted (in shares)     140    
Units outstanding at the end of the period (in shares) 169   169    
Forfeited (in shares)     (3)    
Weighted Average Grant Date Fair Value          
Units outstanding at the beginning of the period (in dollars per share)     $ 12.47    
Granted (in dollars per share)     $ 13.85    
Units outstanding at the end of the period (in dollars per share) $ 13.39   $ 13.39    
Forfeited (in dollars per share)     $ 14.38    
Share-based compensation, additional disclosures          
Vesting period     4 years    
Discount for lack of marketability ( as a percent)     17.50%