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Schedule of Cash Flow Hedges (Details)
$ in Thousands, € in Millions
Sep. 30, 2017
USD ($)
Sep. 30, 2017
EUR (€)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
EUR (€)
Derivative        
Derivative Asset, Noncurrent $ 17,238   $ 17,907  
Derivative Liability, Noncurrent 52,068   3,128  
Settlement of Notional Amounts | €   € 15    
Cross Currency Interest Rate Contract        
Derivative        
Derivative, Notional Amount 410,511   422,408  
Derivative Asset, Noncurrent 2,184   1,486  
Derivative Liability, Noncurrent 52,068   3,128  
Cross Currency Interest Rate Contract | 2016 Cross Currency Swaps        
Derivative        
Derivative, Notional Amount     422,000 € 400
Interest Rate Swap        
Derivative        
Derivative, Notional Amount 590,000   590,000  
Derivative Asset, Noncurrent 15,054   $ 16,421  
Derivative Liability, Noncurrent $ 0