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Schedule of Debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Current portion of debt $ 18,281 $ 14,063
Long-term debt 303,949 290,460
Secured Debt [Member]    
Debt Instrument [Line Items]    
Total debt 322,804 305,292
Current portion of debt 18,281 14,063
Long-term debt 303,949 290,460
USD Denominated Term Loan [Member]    
Debt Instrument [Line Items]    
USD denominated term loan 198,281 208,125
Deferred Finance Costs, Noncurrent, Net 574 769
Line of Credit [Member]    
Debt Instrument [Line Items]    
Multicurrency revolving line of credit $ 124,523 $ 97,167