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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Federal tax rate, percent |  |  | 35.00% |  |  |
Income tax benefit from the Tax Act |  |  | $ 39,300 |  |  |
Income tax provision |  |  | $ 90,699 | $ 111,199 | $ 106,256 |
Actual income tax rates |  |  | 28.50% | 37.50% | 38.10% |
Unrecognized income tax benefits |  |  | $ 841 | $ 3,982 | $ 4,761 |
Unrecognized income tax benefits, if recognized, that would favorably affect the effective income tax rate |  |  |  | 2,200 |  |
Accrued interest expense related to unrecognized income tax benefits |  |  | 100 | 500 |  |
Interest expense related to unrecognized income tax benefits recognized |  |  | 100 | 100 |  |
Reversal of accrued interest expense related to unrecognized income tax benefits |  |  | 500 | 100 |  |
Unrecognized tax benefits, decrease resulting from settlements with taxing authorities | $ 3,300 |  |  |  |  |
Deferred tax liabilities, net |  |  | 64,697 | 117,362 |  |
Valuation allowance for deferred tax assets |  |  | 3,825 | 3,531 |  |
Cash and cash equivalents |  |  | 467,430 | 464,617 | $ 486,831 | $ 432,056
Other Long-Term Liabilities |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Income tax reserve |  |  | 900 | 4,500 |  |
Other Assets |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Deferred tax liabilities, net |  |  | 10,000 | 12,900 |  |
Other Long-Term Obligations |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Deferred tax liabilities, net |  |  | 74,700 | $ 130,300 |  |
United Kingdom Subsidiary |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Trading losses |  |  | 12,300 |  |  |
Cash and cash equivalents |  |  | 43,300 |  |  |
Puerto Rico Subsidiary |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Cash and cash equivalents |  |  | $ 3,000 |  |  |
Subsequent Event | Scenario, Plan |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Federal tax rate, percent |  | 21.00% |  |  |  |

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- Definition Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all domestic and foreign income tax obligations due beyond one year or the operating cycle, whichever is longer. Alternate captions include income taxes payable, noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(15)(1)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(15)(b)(1)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(24)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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