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Fair Value Measurement - Carrying Amounts and Fair Values of Our Long-Term Debt Obligations (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Current portion of long-term debt $ 3,208 $ 3,191
Long-term debt 162,145 163,758
Term Loan Facility | Secured Debt    
Debt Instrument [Line Items]    
Carrying amount 165,353 166,949
Fair Value 165,566 $ 169,972
Current portion of long-term debt $ 3,200