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Fair Value Measurements - Long-term Fixed Interest Rate Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Carrying value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	$ 676,880	$ 286,660
Fair value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	698,087	293,522
Real Estate Mortgages And Other Debt | Carrying value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	376,880	286,660
Real Estate Mortgages And Other Debt | Fair value | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	385,337	293,522
Senior Notes Due 2025 | Senior Notes | Carrying value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	300,000	0
Senior Notes Due 2025 | Senior Notes | Fair value | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	$ 312,750	$ 0

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- Definition

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