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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Income Tax Disclosure [Abstract] |  |  |  |
Income tax benefit related to excess tax benefits associated with vesting of RSUs |  |  | $ 400 |
Income taxes | $ 229 | $ 14,538 | 13,385 | $ 46,803
Valuation Allowance [Line Items] |  |  |  |
Out of period adjustment resulting in an income tax expense (benefit) |  |  | (1,000) |
Tax Cuts and Jobs Act, incomplete accounting, provisional income tax expense (benefit) |  |  | (600) |
Tax Act and Jobs Act, incomplete accounting, including prior year income taxes, provisional income tax expense (benefit) |  |  | $ (1,600) |
Effective income tax rate reconciliation, Tax Cuts and Jobs Act, percent |  |  | 2.80% |
Retained Earnings [Member] | Accounting Standards Update 2018-02 [Member] |  |  |  |
Valuation Allowance [Line Items] |  |  |  |
Deferred tax benefit reclassified from AOCI to Retained Earnings |  |  | $ 400 |
AOCI Attributable to Parent [Member] | Accounting Standards Update 2018-02 [Member] |  |  |  |
Valuation Allowance [Line Items] |  |  |  |
Deferred tax benefit reclassified from AOCI to Retained Earnings |  |  | $ (400) |

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