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Fair Value Measurements (Carrying Amounts and Estimated Fair Values of Financial Instruments) (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Carrying Amount [Member] | Level 2 [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Long-term debt, including current portion [1] $ (1,035,004) $ (759,854)
Carrying Amount [Member] | Level 2 [Member] | Interest rate contracts [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Derivative assets related to interest rate swaps 144,583 33,497
Derivative liabilities related to interest rate swaps 0 (24,060)
Carrying Amount [Member] | Level 2 [Member] | Term Loans [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Long-term debt, including current portion (969,269) (691,119)
Carrying Amount [Member] | Level 2 [Member] | Revenue bonds [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Long-term debt, including current portion (65,735) (65,735)
Carrying Amount [Member] | Level 2 [Member] | Medium-term notes [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Long-term debt, including current portion 0 (3,000)
Carrying Amount [Member] | Level 3 [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Company owned life insurance 4,311 3,923
Fair Value [Member] | Level 2 [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Long-term debt, including current portion [1] (1,026,234) (777,420)
Fair Value [Member] | Level 2 [Member] | Interest rate contracts [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Derivative assets related to interest rate swaps 144,583 33,497
Derivative liabilities related to interest rate swaps 0 (24,060)
Fair Value [Member] | Level 2 [Member] | Term Loans [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Long-term debt, including current portion (961,632) (705,135)
Fair Value [Member] | Level 2 [Member] | Revenue bonds [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Long-term debt, including current portion (64,602) (69,278)
Fair Value [Member] | Level 2 [Member] | Medium-term notes [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Long-term debt, including current portion 0 (3,007)
Fair Value [Member] | Level 3 [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Company owned life insurance $ 4,311 $ 3,923
[1]

1

The carrying amount of long-term debt includes principal and unamortized discounts.