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Income Taxes - Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Federal Statutory Tax Rate |  |  |  |  |  |  |  |  | 21.00% | 35.00% | 35.00% |
Tax Cut and Jobs Act of 2017 benefit to income tax expense |  |  |  |  |  |  |  |  |  | $ 98,500,000 |  |
Income taxes | $ 21,381,000 | $ 26,296,000 | $ 27,065,000 | $ 17,248,000 | $ (60,354,000) | $ 33,565,000 | $ 33,282,000 | $ 22,772,000 | $ 91,990,000 | 29,265,000 | $ 118,181,000 |
Deferred tax assets, operating loss carryforwards, state and local | 12,200,000 |  |  |  |  |  |  |  | 12,200,000 |  |  |
Unrecognized tax benefits that would impact effective tax rate | 13,900,000 |  |  |  | $ 13,400,000 |  |  |  | 13,900,000 | 13,400,000 |  |
Unrecognized tax benefits, income tax penalties and interest accrued | 1,900,000 |  |  |  |  |  |  |  | 1,900,000 |  |  |
Unrecognized tax benefits, interest benefit |  |  |  |  |  |  |  |  |  | 300,000 | $ 300,000 | $ 300,000
Unrecognized tax penalties |  |  |  |  |  |  |  |  | 0 |  |  |
Foreign [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Tax credits | $ 46,500,000 |  |  |  |  |  |  |  | 46,500,000 |  |  |
AFS Investments [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Income taxes |  |  |  |  |  |  |  |  |  | 7,800,000 |  |
Canada [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Amount recognized for one-time mandatory deemed repatriation |  |  |  |  |  |  |  |  | $ 2,700,000 | 6,100,000 |  |
Tax Cuts and Jobs Act of 2017, incomplete accounting, transition tax for accumulated foreign earnings, provisional income tax expense |  |  |  |  |  |  |  |  |  | $ 3,000,000.0 |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Provisional information accounting incomplete measurement period |  |  |  |  |  |  |  |  |  | 1 year |  |

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