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Financial Instruments (Estimated Fair Values of Financial Instruments) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Carrying Amount [Member] | Level 1 [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash, cash equivalents and restricted cash $ 79,441 $ 120,457
Carrying Amount [Member] | Level 2 [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Long-term debt, including current portion [1] (786,690) (576,013)
Carrying Amount [Member] | Level 2 [Member] | Interest rate contracts [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Derivative assets 1,510 1,169
Derivative liabilities related to interest rate swaps (2,888)  
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 (539,169) (343,500)
Carrying Amount [Member] | Level 2 [Member] | Senior notes [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Long-term debt, including current portion (149,786) (149,528)
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 (94,735) (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) (17,250)
Carrying Amount [Member] | Level 3 [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Company owned life insurance (COLI) 3,104 1,996
Fair Value [Member] | Level 1 [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash, cash equivalents and restricted cash 79,441 120,457
Fair Value [Member] | Level 2 [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Long-term debt, including current portion [1] (789,928) (588,479)
Fair Value [Member] | Level 2 [Member] | Interest rate contracts [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Derivative assets 1,510 1,169
Derivative liabilities related to interest rate swaps (2,888)  
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 (539,037) (345,222)
Fair Value [Member] | Level 2 [Member] | Senior notes [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Long-term debt, including current portion (154,328) (161,063)
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 (93,144) (63,967)
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 (3,419) (18,227)
Fair Value [Member] | Level 3 [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Company owned life insurance (COLI) $ 3,104 $ 1,996
[1] The carrying amount of long-term debt includes principal and unamortized discounts. Long-term debt also includes the $29.0 million of revenue bonds for the MDF facility which are classified as held for sale at December 31, 2018. See Note 3 Assets and Liabilities Held for Sale for further information.