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Fair Value Measurements - Fair Value of Other Financial Instruments (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Fair value disclosures |  |
Debt, net | $ 1,521,211 | $ 1,520,530
Carrying amount |  |
Fair value disclosures |  |
Debt, net | 1,521,211 | 1,520,530
Estimated fair value |  |
Fair value disclosures |  |
Debt, net | $ 1,511,291 | $ 1,463,643

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