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Debt Schedule of Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Total debt $ 305,292  
Current portion of debt 14,063 $ 11,250
Long-term debt 290,460 358,915
USD Denominated Term Loan [Member]    
Debt Instrument [Line Items]    
Loans Payable to Bank 208,125 219,375
Debt Issuance Costs, Noncurrent, Net 769 1,047
Line of Credit [Member]    
Debt Instrument [Line Items]    
Long-term Line of Credit 97,167 151,837
Secured Debt [Member]    
Debt Instrument [Line Items]    
Total debt 305,292 371,212
Current portion of debt 14,063 11,250
Long-term debt $ 290,460 $ 358,915