XML 56 R43.htm IDEA: XBRL DOCUMENT v3.7.0.1
Fair Value of Financial Instruments - Fair Value of Certain Financial Assets and Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying value of debt $ 918,009 $ 920,539
Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying value of debt 918,009 920,539
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of debt $ 920,018 $ 906,156