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Summary of Significant Accounting Policies (Fair Values of Derivative Instruments Designated as Cash Flow Hedges) (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Derivatives, Fair Value [Line Items]    
Derivatives designated as cash flow hedges, liability derivatives $ (51,081) $ (94,689)
Other Long-term Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivatives designated as cash flow hedges, liability derivatives   (74,666)
Interest Rate Swap [Member] | Accrued Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivatives designated as cash flow hedges, liability derivatives (18,675) $ (20,023)
Interest Rate Swap [Member] | Other Long-term Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivatives designated as cash flow hedges, liability derivatives $ (32,406)