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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) $ (6,341) $ (2,760) $ (57,806) $ (18,471)  
Effective Income Tax Rate, Percent     (46.48%) (37.60%)  
Federal Statutory Income Tax Rate, Percent     21.00% 21.00% 35.00%
Tax Adjustments, Settlements, and Unusual Provisions       $ 21,000  
U.S. Tax Cut and Jobs Act of 2017          
Change in Accounting Estimate [Line Items]          
Total Provision for Income Tax Expense (Benefit)       200  
Industry Issue Resolution          
Change in Accounting Estimate [Line Items]          
Tax Adjustments, Settlements, and Unusual Provisions       $ 5,000