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Fair Values of Financial Instruments Schedule of Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Dec. 31, 2013
Assets        
Cash and cash equivalents $ 109,458 $ 112,371 $ 122,475 $ 124,805
USD Denominated Term Loan [Member]        
Liabilities        
USD denominated term loan 222,188 232,500    
Reported Value Measurement [Member]        
Assets        
Cash and cash equivalents 109,458 112,371    
Foreign exchange forwards 331 107    
Interest Rate Derivative Assets, at Fair Value 0 75    
Liabilities        
Interest rate swaps 1,111 1,317    
Foreign exchange forwards 383 236    
Reported Value Measurement [Member] | USD Denominated Term Loan [Member]        
Liabilities        
USD denominated term loan 222,188 232,500    
Reported Value Measurement [Member] | Line of Credit [Member]        
Liabilities        
Multicurrency revolving line of credit 158,519 91,469    
Estimate of Fair Value Measurement [Member]        
Assets        
Cash and cash equivalents 109,458 112,371    
Foreign exchange forwards 331 107    
Interest Rate Derivative Assets, at Fair Value 0 75    
Liabilities        
Interest rate swaps 1,111 1,317    
Foreign exchange forwards 383 236    
Estimate of Fair Value Measurement [Member] | USD Denominated Term Loan [Member]        
Liabilities        
Long-term Debt, Fair Value 222,177 231,645    
Estimate of Fair Value Measurement [Member] | Line of Credit [Member]        
Liabilities        
Line of Credit Facility, Fair Value of Amount Outstanding $ 158,523 $ 91,124