Quarterly report pursuant to Section 13 or 15(d)

Share-Based Compensation (Details 2)

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Share-Based Compensation (Details 2) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Stock options
   
Share-based Compensation    
Outstanding options to purchase (in shares) 2,243 1,784
Exercisable (in shares) 1,061 1,011
Expected to vest (in shares) 962 644
Aggregate Intrinsic value, outstanding $ 6,013 $ 5,315
Aggregate Intrinsic value, exercisable 5,451 5,016
Aggregate Intrinsic value, expected to vest 534 281
2012 Incentive Plan | RSUs
   
Number of Shares    
Units outstanding at the beginning of the period (in shares) 18  
Units outstanding at the end of the period (in shares) 18  
Weighted Average Grant Date Fair Value    
Units outstanding at the beginning of the period (in dollars per share) $ 12.07  
Units outstanding at the end of the period (in dollars per share) $ 12.07  
Share-based compensation, additional disclosures    
Share-based compensation expense 74  
Related tax benefits 29  
Unrecognized share-based compensation expense $ 25 $ 99
Weighted-average period over which the remaining compensation cost is expected to be recognized 2 months 12 days