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Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents - carrying amount $ 20,776 $ 15,420
Restricted cash - carrying amount 3,369 2,820
Notes payable 185,620 211,300
Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents - carrying amount 20,776 15,420
Restricted cash - carrying amount 3,369 2,820
Notes payable 185,620 211,300
Long-term debt, including current maturities - carrying amount 2,956,578 3,115,143
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and Cash Equivalents, Fair Value Disclosure 20,776 15,420
Restricted Cash Fair Value Disclosure 3,369 2,820
Notes payable - fair value 185,620 211,300
Long-term debt, including current maturities - fair value $ 3,039,108 $ 3,350,544