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Income Taxes (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Operating Loss Carryforwards [Line Items] |  |  |  |
Federal tax rate, percent |  | 21.00% | 35.00% |
Income tax benefit from the Tax Act |  |  | $ 39,300,000 |
Income tax provision |  | $ 109,106,000 | $ 90,699,000 | $ 111,199,000
Actual income tax rates |  | 27.60% | 28.50% | 37.50%
Income tax expense, foreign minimum tax |  | $ 600,000 |  |
Cash and cash equivalents |  | 363,907,000 | $ 467,430,000 |
Unrecognized income tax benefits |  | 0 | 841,000 | $ 3,982,000
Accrued interest expense related to unrecognized income tax benefits |  | 0 | 100,000 |
Interest expense related to unrecognized income tax benefits recognized |  | 0 | 100,000 |
Reversal of accrued interest expense related to unrecognized income tax benefits |  | 100,000 | 500,000 |
Unrecognized tax benefits, decrease resulting from settlements with taxing authorities | $ 3,300,000 |  |  |
Deferred tax liabilities, net |  | 70,848,000 | 64,697,000 |
Valuation allowance for deferred tax assets |  | 3,855,000 | 3,825,000 |
Other Assets |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Deferred tax liabilities, net |  | 4,700,000 | 10,000,000 |
Other Long-Term Obligations |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Deferred tax liabilities, net |  | 75,500,000 | $ 74,700,000 |
United Kingdom Subsidiary |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Trading losses |  | 4,200,000 |  |
Non-US [Member] | Subsidiaries [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Undistributed earnings of foreign subsidiaries |  | 54,600,000 |  |
Cash and cash equivalents |  | $ 60,600,000 |  |

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