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Stock-Based Compensation - Schedule of Stock-Based Compensation Expense Recognized When Options, Restricted Stock Awards, Performance Stock Awards and Employee Stock Purchase Plan Shares Vested (Details) (General and Administrative Expenses [Member], USD $)
In Thousands, unless otherwise specified |
3 Months Ended | |
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Mar. 31, 2015
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Mar. 31, 2014
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General and Administrative Expenses [Member]
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| Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] | ||
| Total stock-based compensation expense | $ 1,904 | $ 1,965 |
| Tax benefit from stock-based compensation expense | (724) | (753) |
| Total stock-based compensation expense, net of tax | $ 1,180 | $ 1,212 |