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Fair Value Measurement - Carrying Amounts and Fair Values of Our Long-Term Debt Obligations (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Current portion of long-term debt $ 3,335 $ 9,102
Long-term debt 154,950 154,656
Term Loan Facility | Secured Debt    
Debt Instrument [Line Items]    
Carrying Amount 158,285 163,758
Fair Value 158,285 $ 161,759
Current portion of long-term debt $ 3,300