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Stock Based Compensation - Excess Tax Benefit (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Share Based Compensation [Abstract]        
Excess Tax Benefit From Stock Option Exercises $ 83 $ 168 $ 452 $ 1,420
Excess Tax Benefit Related to Stock Option Exercises, Cash Flow     $ 452 $ 1,420