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Stock Incentive Plans and Stock-Based Compensation (Details 1) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Summary of stock options outstanding        
Intrinsic value of options exercised in the period $ 91 $ 0 $ 680 $ 34
Stock options:        
Aggregate intrinsic value $ 1,934 $ 415 $ 1,934 $ 415
Weighted average contractual term of options     7 years 26 days 7 years 4 months 28 days