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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

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