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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Deferred Tax Assets Tax Credit Carryforwards Domestic $ 64,081 $ 49,937
Deferred Tax Assets Tax Credit Carryforwards State And Local 7,369 7,750
Net operating loss carryforwards - Federal 11,670 27,935
Uncategorized Tax Benefits 51,569 $ 51,596
Tax impact from CARES Act 41,600  
Reduction of the deferred asset associated with the federal tax credit carryforwards 51,400  
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit 23,000  
Begin To Expire In 2033 [Member]    
Deferred Tax Assets Tax Credit Carryforwards Domestic 67,800  
Begin To Expire In 2021 [Member]    
Deferred Tax Assets Tax Credit Carryforwards State And Local $ 7,400