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Long-Term Debt - Fair Value (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Secured Debt [Member] | 2013 Term Loan Facility Maturing November 15, 2020 [Member] | Level 2 [Member]    
Debt Instrument [Line Items]    
Fair market value of debt $ 163,115 $ 104,658