Quarterly report pursuant to Section 13 or 15(d)

Income Taxes (Details)

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Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]            
Income tax expense $ 11,525 $ 108,901 $ 162,344 $ 342,387    
Income Taxes [Line Items]            
Effective income tax rate percent 3.30% 28.30% 14.90% 33.30%    
Valuation allowance $ 65,878   $ 65,878     $ 52,883
Forecast            
Income Taxes [Line Items]            
Effective income tax rate percent         17.00%