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Fair Value Measurements (Carrying Amounts and Estimated Fair Values of Financial Instruments) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Carrying Amount [Member] | Level 2 [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Long-term debt, including current portion [1] $ (759,204) $ (758,555)
Carrying Amount [Member] | Level 2 [Member] | Interest rate contracts [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Derivative assets 18,529 1,601
Derivative liabilities related to interest rate swaps (46,110) (22,398)
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 (690,469) (689,820)
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 (3,000) (3,000)
Carrying Amount [Member] | Level 3 [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Company owned life insurance 3,328 4,157
Fair Value [Member] | Level 2 [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Long-term debt, including current portion [1] (788,061) (775,117)
Fair Value [Member] | Level 2 [Member] | Interest rate contracts [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Derivative assets 18,529 1,601
Derivative liabilities related to interest rate swaps (46,110) (22,398)
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 (716,631) (703,437)
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 (67,885) (68,200)
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 (3,545) (3,480)
Fair Value [Member] | Level 3 [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Company owned life insurance $ 3,328 $ 4,157
[1] The carrying amount of long-term debt includes principal and unamortized discounts