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Stock Incentive Plans and Stock-Based Compensation (Details 1) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Summary of stock options outstanding        
Intrinsic value of options exercised in the period $ 113 $ 0 $ 793 $ 34
Stock options:        
Aggregate intrinsic value $ 3,337 $ 379 $ 3,337 $ 379
Weighted average contractual term of options     6 years 9 months 18 days 7 years 1 month 24 days