Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands |
Dec. 31, 2015 |
Dec. 31, 2014 |
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | |||||||
Cash and cash equivalents - carrying amount | $ 456,535 | $ 21,218 | |||||
Restricted cash - carrying amount | 1,697 | 2,056 | |||||
Notes payable | 76,800 | 75,000 | |||||
Long-term debt, including current maturities - carrying amount | 1,866,866 | 1,542,589 | |||||
Carrying Amount | |||||||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | |||||||
Cash and cash equivalents - carrying amount | 456,535 | 21,218 | |||||
Restricted cash - carrying amount | 1,697 | 2,056 | |||||
Notes payable | 76,800 | 75,000 | |||||
Long-term debt, including current maturities - carrying amount | 1,866,866 | 1,542,589 | |||||
Fair Value | |||||||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | |||||||
Cash and cash equivalents - fair value | [1] | 456,535 | 21,218 | ||||
Restricted Cash - fair value | [1] | 1,697 | 2,056 | ||||
Notes payable - fair value | [1] | 76,800 | 75,000 | ||||
Long-term debt, including current maturities - fair value | [2] | $ 1,992,274 | $ 1,734,555 | ||||
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