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Fair Values of Financial Instruments Schedule of Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Assets        
Cash and cash equivalents $ 132,615 $ 131,018 $ 118,084 $ 112,371
USD Denominated Term Loan [Member]        
Liabilities        
USD denominated term loan 216,563 219,375    
Line of Credit [Member]        
Liabilities        
Multicurrency revolving line of credit 132,572 151,837    
Reported Value Measurement [Member]        
Assets        
Cash and cash equivalents 132,615 131,018    
Foreign exchange forwards 237 27    
Interest Rate Derivative Assets, at Fair Value 0 1,632    
Liabilities        
Interest rate swaps 2,730 868    
Foreign exchange forwards 505 99    
Reported Value Measurement [Member] | USD Denominated Term Loan [Member]        
Liabilities        
USD denominated term loan 216,563 219,375    
Reported Value Measurement [Member] | Line of Credit [Member]        
Liabilities        
Multicurrency revolving line of credit   151,837    
Estimate of Fair Value Measurement [Member]        
Assets        
Cash and cash equivalents 132,615 131,018    
Foreign exchange forwards 237 27    
Interest Rate Derivative Assets, at Fair Value 0 1,632    
Liabilities        
Interest rate swaps 2,730 868    
Foreign exchange forwards 505 99    
Estimate of Fair Value Measurement [Member] | USD Denominated Term Loan [Member]        
Liabilities        
Long-term Debt, Fair Value 215,089 217,830    
Estimate of Fair Value Measurement [Member] | Line of Credit [Member]        
Liabilities        
Line of Credit Facility, Fair Value of Amount Outstanding 131,442 150,570    
Interest Rate Cap [Member] | Estimate of Fair Value Measurement [Member]        
Assets        
Interest Rate Derivative Assets, at Fair Value 689 1,423    
Interest Rate Cap [Member] | Other Noncurrent Assets [Member] | Designated as Hedging Instrument [Member]        
Assets        
Interest Rate Derivative Assets, at Fair Value 689 1,423    
Derivative Asset, Noncurrent $ 689 $ 1,423