Derivative Instruments (Gross Fair Value of Cash Flow Derivative Instruments) (Details) - Designated as Hedging Instrument [Member] - Cash Flow Hedging [Member] - USD ($) $ in Thousands		Dec. 31, 2021	Dec. 31, 2020
Derivatives Fair Value [Line Items]
Asset Derivatives, Fair Value		$ 33,497	$ 18,529
Liability Derivatives, Fair Value		24,060	46,110
Interest rate contracts [Member] | Other Assets Current [Member]
Derivatives Fair Value [Line Items]
Asset Derivatives, Fair Value	[1]	2,191	63
Interest rate contracts [Member] | Other Noncurrent Assets [Member]
Derivatives Fair Value [Line Items]
Asset Derivatives, Fair Value		31,306	18,466
Interest rate contracts [Member] | Accounts Payable and Accrued Liabilities [Member]
Derivatives Fair Value [Line Items]
Liability Derivatives, Fair Value	[1]		1,010
Interest rate contracts [Member] | Other Long-term Obligations [Member]
Derivatives Fair Value [Line Items]
Liability Derivatives, Fair Value		$ 24,060	$ 45,100

[1]   1 Derivative instruments that mature within one year, as a whole, are classified as current.