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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Change in Accounting Estimate [Line Items]          
Income tax expense (benefit) $ (58,576) $ (148,073) $ (377,042) $ 57,278  
Effective income tax rate, percent     22.53% 4.38%  
Federal Statutory income tax rate, percent     21.00% 21.00% 35.00%
U.S. Tax Cut and Jobs Act of 2017          
Change in Accounting Estimate [Line Items]          
Tax Cuts and Jobs Act, Incomplete Accounting, Provisional Income Tax Expense (Benefit)       $ 500  
Industry Issue Resolution          
Change in Accounting Estimate [Line Items]          
Tax Adjustments, Settlements, and Unusual Provisions       $ 193,000