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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)