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Fair Value Measurements - Fair Value of Debt (Details) - Fixed rate debt - Level 2 - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Carrying Amount |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total debt | $ 685,947 | $ 683,577
Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total debt | $ 687,000 | $ 686,000

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