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Schedule of Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Dec. 31, 2015
Assets        
Cash and cash equivalents $ 127,880 $ 133,565 $ 132,014 $ 131,018
USD Denominated Term Loan [Member]        
Liabilities        
USD denominated term loan 202,500 208,125    
Line of Credit [Member]        
Liabilities        
Multicurrency revolving line of credit 122,497 97,167    
Reported Value Measurement [Member]        
Assets        
Cash and cash equivalents 127,880 133,565    
Foreign exchange forwards 62 169    
Liabilities        
Interest rate swaps 114 934    
Foreign exchange forwards 382 449    
Reported Value Measurement [Member] | USD Denominated Term Loan [Member]        
Liabilities        
USD denominated term loan 202,500 208,125    
Reported Value Measurement [Member] | Line of Credit [Member]        
Liabilities        
Multicurrency revolving line of credit 122,497 97,167    
Estimate of Fair Value Measurement [Member]        
Assets        
Cash and cash equivalents 127,880 133,565    
Foreign exchange forwards 62 169    
Liabilities        
Interest rate swaps 114 934    
Foreign exchange forwards 382 449    
Estimate of Fair Value Measurement [Member] | USD Denominated Term Loan [Member]        
Liabilities        
Long-term Debt, Fair Value 200,309 205,676    
Estimate of Fair Value Measurement [Member] | Line of Credit [Member]        
Liabilities        
Line of Credit Facility, Fair Value of Amount Outstanding 120,688 95,906    
Interest Rate Swap [Member] | Reported Value Measurement [Member]        
Assets        
Derivative Asset, Noncurrent 1,219 1,830    
Interest Rate Swap [Member] | Estimate of Fair Value Measurement [Member]        
Assets        
Derivative Asset, Noncurrent 1,219 1,830    
Interest Rate Cap [Member] | Reported Value Measurement [Member]        
Assets        
Derivative Asset, Noncurrent 444 946    
Interest Rate Cap [Member] | Estimate of Fair Value Measurement [Member]        
Assets        
Derivative Asset, Noncurrent $ 444 $ 946