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Fair Value of Financial Instruments - Fair Value of Certain Financial Assets and Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying value of debt $ 922,962 $ 1,169,749
Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying value of debt 922,962 1,169,749
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of debt $ 918,134 $ 1,152,351