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Debt and Credit Facilities - Summary of Debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Current portion of long-term debt $ 3,217 $ 3,191
Long-term debt 161,340 163,758
Term Loan Facility | Secured Debt    
Debt Instrument [Line Items]    
Long-term debt 164,557 $ 166,949
Current portion of long-term debt 3,200  
Deferred financing cost, current 600  
Deferred financing cost, noncurrent 1,800  
Debt discount, current 600  
Debt discount, noncurrent $ 2,000