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Income Taxes (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Operating Loss Carryforwards [Line Items] |  |  |  |
Income tax provision | $ 111,199 | $ 106,256 | $ 103,528 |
Actual income tax rates | 37.50% | 38.10% | 37.40% |
Unrecognized income tax benefits | $ 3,982 | $ 4,761 | $ 5,203 |
Unrecognized income tax benefits, if recognized, that would favorably affect the effective income tax rate | 2,200 | 3,000 |  |
Accrued interest expense related to unrecognized income tax benefits | 500 | 400 |  |
Interest expense related to unrecognized income tax benefits recognized | 100 | 100 |  |
Reversal of accrued interest expense related to unrecognized income tax benefits | 100 | 100 |  |
Unrecognized income tax benefits to be recognized in the next twelve months | 3,300 |  |  |
Deferred tax liabilities, net | 117,362 | 120,598 |  |
Valuation allowance for deferred tax assets | 3,531 | 805 |  |
Cash and cash equivalents | 464,617 | 486,831 | $ 432,056 | $ 439,813
Other Long-Term Liabilities |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Income tax reserve | 4,500 | 5,200 |  |
Prepaid Expenses and Other |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Deferred tax liabilities, net | 41,700 | 36,000 |  |
Other Assets |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Deferred tax liabilities, net | 12,900 | 11,300 |  |
Other Long-Term Obligations |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Deferred tax liabilities, net | 172,000 | $ 167,900 |  |
United Kingdom Subsidiary |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Trading losses | 17,900 |  |  |
Undistributed foreign earnings | 28,100 |  |  |
Cash and cash equivalents | 30,200 |  |  |
Puerto Rico Subsidiary |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Undistributed foreign earnings | 1,400 |  |  |
Cash and cash equivalents | 3,000 |  |  |
Income tax expense from repatriation of foreign cash held | $ 500 |  |  |

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