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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
Dec. 31, 2018
Income Tax Examination [Line Items]          
Effective income tax rate reconciliation, percent 25.00% 22.00% 35.00% 1.00%  
Unrecognized tax benefits $ 113,552   $ 113,552   $ 112,558
Effective income tax rate reconciliation, at federal statutory income tax rate, percent 21.00% 21.00% 21.00%    
Minimum [Member]          
Income Tax Examination [Line Items]          
Open tax year     2010    
Maximum [Member]          
Income Tax Examination [Line Items]          
Open tax year     2017