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Fair Values of Financial Instruments Schedule of Fair Values of Financial Instruments (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
Dec. 31, 2012
Assets        
Cash and cash equivalents $ 122,475 $ 124,805 $ 122,047 $ 136,411
USD Denominated Term Loan [Member]
       
Liabilities        
USD denominated term loan 240,000 258,750    
Reported Value Measurement [Member]
       
Assets        
Cash and cash equivalents 122,475 124,805    
Foreign exchange forwards 36 41    
Interest Rate Derivative Assets, at Fair Value 162 0    
Liabilities        
Interest rate swaps 1,474 2,031    
Foreign exchange forwards 252 145    
Reported Value Measurement [Member] | USD Denominated Term Loan [Member]
       
Liabilities        
USD denominated term loan 240,000 258,750    
Reported Value Measurement [Member] | Line of Credit [Member]
       
Liabilities        
Multicurrency revolving line of credit 70,000 120,000    
Estimate of Fair Value Measurement [Member]
       
Assets        
Cash and cash equivalents 122,475 124,805    
Foreign exchange forwards 36 41    
Interest Rate Derivative Assets, at Fair Value 162 0    
Liabilities        
Interest rate swaps 1,474 2,031    
Foreign exchange forwards 252 145    
Estimate of Fair Value Measurement [Member] | USD Denominated Term Loan [Member]
       
Liabilities        
Long-term Debt, Fair Value 239,495 258,011    
Estimate of Fair Value Measurement [Member] | Line of Credit [Member]
       
Liabilities        
Line of Credit Facility, Fair Value of Amount Outstanding $ 69,836 $ 119,609