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Debt Schedule of Debt (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Current portion of debt $ 11,250 $ 30,000
Long-term debt 361,708 293,969
Secured Debt [Member]    
Debt Instrument [Line Items]    
Total debt 372,958 323,969
Current portion of debt 11,250 30,000
Long-term debt 361,708 293,969
USD Denominated Term Loan    
Debt Instrument [Line Items]    
USD denominated term loan 225,000 232,500
Multicurrency revolving line of credit    
Debt Instrument [Line Items]    
Multicurrency revolving line of credit   91,469
Reported Value Measurement [Member] | USD Denominated Term Loan    
Debt Instrument [Line Items]    
USD denominated term loan 225,000 232,500
Reported Value Measurement [Member] | Line of Credit [Member]    
Debt Instrument [Line Items]    
Multicurrency revolving line of credit $ 147,958 $ 91,469