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Income Taxes Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Income Tax Examination [Line Items]      
Effective income tax rate reconciliation, percent 102.00% 7.00%  
Unrecognized tax benefits $ 113,543   $ 112,558
Effective income tax rate reconciliation, at federal statutory income tax rate, percent 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