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Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and cash equivalents $ 12,225 $ 20,776 $ 30,947
Restricted cash 3,494 3,369 2,958
Notes payable 164,650 185,620 164,200
Carrying Amount      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and cash equivalents 12,225 20,776 30,947
Restricted cash 3,494 3,369 2,958
Notes payable 164,650 185,620 164,200
Long-term debt, including current maturities 2,956,042 2,956,578 3,114,530
Fair Value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and cash equivalents, Fair Value 12,225 20,776 30,947
Restricted Cash Fair Value Disclosure 3,494 3,369 2,958
Notes payable, Fair Value 164,650 185,620 164,200
Long-term debt, including current maturities, Fair Value $ 3,137,538 $ 3,039,108 $ 3,265,965