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Stock Incentive Plans (Details 3) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Summary of stock-based compensation expense related to stock option and restricted stock unit awards      
Stock-based compensation expense included in selling, general and administrative expenses $ 695 $ 473 $ 192
Deferred income taxes 272 188 76
Stock-based compensation expense related to stock options and restricted stock units, net of tax $ 423 $ 285 $ 116