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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Income tax provision | $ 32,911 | $ 28,727 | $ 51,880 | $ 48,952 |
Effective income tax rates | 37.50% | 37.80% | 37.60% | 37.80% |
Actual income tax rates | 36.80% | 38.00% | 36.30% | 37.90% |
Excess tax benefit from share-based compensation, tax provision | $ 1,800 |  |  |  |
Unrecognized income tax benefits | 4,800 |  | $ 4,800 |  | $ 4,800
Unrecognized income tax benefits, if recognized, that would favorably affect the effective income tax rate | 3,000 |  | 3,000 |  | 3,000
Accrued interest expense related to unrecognized income tax benefits | 500 |  | 500 |  | $ 400
Interest expense related to unrecognized income tax benefits | 100 | $ 100 | 100 | $ 100 |
Unrecognized income tax benefits to be recognized in the next twelve months | $ 4,100 |  | $ 4,100 |  |

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