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Commitments And Contingencies (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Jan. 01, 2019
Trading Activity, Gains and Losses, Net [Line Items]      
Asset [1] $ 1,578,917 $ 1,698,218  
Liabilities 802,253 $ 832,932  
Contracted future purchases $ 302,800    
Minimum [Member]      
Trading Activity, Gains and Losses, Net [Line Items]      
Operating Lease Remaining Lease Term 1 year    
Maximum [Member]      
Trading Activity, Gains and Losses, Net [Line Items]      
Operating Lease Remaining Lease Term 16 years 10 months 24 days    
Restatement Adjustment [Member] | Accounting Standards Update 2016-02 [Member]      
Trading Activity, Gains and Losses, Net [Line Items]      
Asset     $ 60,200
Liabilities     $ 60,200
[1] Asset balances by segment exclude intercompany payable and receivable balances