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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Income Tax Disclosure [Abstract]    
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities   $ 167,800
Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-based Payment Arrangement, Amount   $ 11,800
Statutory federal rate 21.00% 21.00%