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Income Taxes Reconcililation of Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]    
Balance at Beginning of Period $ 31,516 $ 37,813
Increase in Unrecognized Tax Benefits Resulting from Tax Positions Taken During Prior Periods 0 2,140
Reduction in Unrecognized Tax Benefits Because of the Lapse of the Applicable Statute of Limitations 0 (8,437)
Balance at End of Period $ 31,516 $ 31,516