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Debt and Credit Facilities - Summary of Debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Current portion of long-term debt $ 3,229 $ 9,102
Long-term debt 155,572 154,656
Term Loan Facility | Secured Debt    
Debt Instrument [Line Items]    
Long-term debt 158,801 $ 163,758
Current portion of long-term debt 3,200  
Deferred financing cost, current 600  
Deferred financing cost, noncurrent 1,500  
Debt discount, noncurrent $ 1,700