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Long-Term Debt Outstanding borrowings (Details)
€ in Thousands, £ in Thousands, CAD in Thousands, AUD in Thousands, $ in Thousands
Sep. 30, 2015
EUR (€)
Sep. 30, 2015
GBP (£)
Sep. 30, 2015
CAD
Sep. 30, 2015
USD ($)
Dec. 31, 2014
AUD
Dec. 31, 2014
EUR (€)
Dec. 31, 2014
CAD
Dec. 31, 2014
USD ($)
Line of Credit Facility [Line Items]                
Outstanding borrowings       $ 2,220,694       $ 1,603,772
United States Revolving Loan [Member] | Revolving Credit Facility [Member]                
Line of Credit Facility [Line Items]                
Outstanding borrowings       $ 20,000       $ 11,000
Interest rate 2.19% 2.19% 2.19% 2.19% 1.67% 1.67% 1.67% 1.67%
Canadian Revolving Loan [Member] | Revolving Credit Facility [Member]                
Line of Credit Facility [Line Items]                
Outstanding borrowings     CAD 35,500 $ 26,501     CAD 24,000 $ 20,688
Interest rate 2.78% 2.78% 2.78% 2.78% 2.79% 2.79% 2.79% 2.79%
Australian Revolving Loan [Member] | Revolving Credit Facility [Member]                
Line of Credit Facility [Line Items]                
Outstanding borrowings         AUD 8,000     $ 6,538
Interest rate         6.44% 6.44% 6.44% 6.44%
United Kingdom Revolving Loan [Member] | Revolving Credit Facility [Member]                
Line of Credit Facility [Line Items]                
Outstanding borrowings   £ 5,500   $ 8,324        
Interest rate 2.51% 2.51% 2.51% 2.51%        
European Revolving Loan [Member] | Revolving Credit Facility [Member]                
Line of Credit Facility [Line Items]                
Outstanding borrowings € 9,775     $ 10,935   € 4,100   $ 4,961
Interest rate 2.12% 2.12% 2.12% 2.12% 1.51% 1.51% 1.51% 1.51%