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Financial Instruments (Estimated Fair Values of Financial Instruments) (Details) - USD ($)
$ in Thousands
Sep. 30, 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 $ 141,243 $ 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] (786,463) (576,013)
Carrying Amount [Member] | Level 2 [Member] | Interest rate contracts [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Derivative assets 3,392 1,169
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 (539,007) (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 (149,721) (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 asset (COLI) 2,741 1,996
Fair Value [Member] | Level 1 [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash, cash equivalents and restricted cash 141,243 120,457
Fair Value [Member] | Level 2 [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Long-term debt, including current portion [1] (789,528) (588,479)
Fair Value [Member] | Level 2 [Member] | Interest rate contracts [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Derivative assets 3,392 1,169
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 (536,158) (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 (156,375) (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 (93,539) (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 (3,456) (18,227)
Fair Value [Member] | Level 3 [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Company owned life insurance asset (COLI) $ 2,741 $ 1,996
[1] The carrying amount of long-term debt includes principal and unamortized discounts.