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Derivative Instruments (Gross Fair Value of Derivative Instruments) (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Derivatives Fair Value [Line Items] |  |  |
Asset Derivatives, Fair Value |  | $ 38,428 | $ 18,529
Liability Derivatives, Fair Value |  | 31,213 | 46,110
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Interest rate contracts [Member] | Other Noncurrent Assets [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Asset Derivatives, Fair Value |  | 36,743 | 18,466
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Interest rate contracts [Member] | Other Assets Current [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Asset Derivatives, Fair Value | [1] | 1,685 | 63
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Interest rate contracts [Member] | Other Long-term Obligations [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Liability Derivatives, Fair Value |  | 30,743 | 45,100
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Interest rate contracts [Member] | Accounts Payable and Accrued Liabilities [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Liability Derivatives, Fair Value | [1] | $ 470 | $ 1,010
[1] | Derivative instruments that mature within one year, as a whole, are classified as current.

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