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Schedule of Cash Flow Hedges (Details)
$ in Thousands, € in Millions
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
EUR (€)
Interest Rate Swap [Member]        
Derivative        
Derivative, Notional Amount $ 590,000 $ 590,000    
Derivative Asset, Noncurrent 24,253 19,102    
Derivative Liability, Noncurrent 0      
Cross Currency Swap        
Derivative        
Derivative, Notional Amount 402,580 406,546    
Derivative Asset, Noncurrent 9,208 5,504    
Derivative Liability, Noncurrent 77,812 61,492    
Derivative Asset, Noncurrent 33,461 24,606    
Derivative Liability, Noncurrent 77,812 $ 61,492    
2016 Interest Rate Swaps [Member] | Interest Rate Swap [Member]        
Derivative        
Derivative, Notional Amount $ 590,000      
2016CrossCurrencySwaps [Member] | Cross Currency Swap        
Derivative        
Derivative, Notional Amount     $ 422,000 € 400