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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Operating Loss Carryforwards [Line Items]      
Income tax expense (benefit), CARES Act $ 43,200    
Permanent income tax expense (benefit), CARES Act 9,600    
Valuation allowance 245,000 $ 188,100  
Tax positions related to prior years for settlement with tax authorities 1,434 13,989 $ 2,104
Decrease resulting from deferred tax assets     11,400
Income tax penalties and interest accrued 200 400 $ 5,700
Unrecognized tax benefits that would impact effective tax rate 1,700    
Amount of possible decrease in unrecognized tax benefits in the next 12 months $ 600    
Cobe Tax Litigation      
Operating Loss Carryforwards [Line Items]      
Tax positions related to prior years for settlement with tax authorities   $ 13,300