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Derivative Instruments and Hedging Activities (Details)
$ in Thousands, € in Millions
Mar. 31, 2019
USD ($)
Mar. 31, 2019
EUR (€)
Dec. 31, 2018
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
EUR (€)
Effect of Netting Derivative Instruments $ (12,000)   $ (14,000)    
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net 4,000        
Derivative Asset, Current 2,242   211    
Derivative Liability, Current 144   127    
Settlement of Notional Amounts | €   € (15)      
Derivative Asset, Noncurrent 19,019   22,636    
Derivative Liability, Noncurrent 29,442   40,870    
Interest Rate Swap Sold [Member]          
Derivative, Notional Amount     110,000    
Interest Rate Swap [Member]          
Derivative, Notional Amount 480,000   480,000    
Derivative Asset, Current 0   0    
Derivative Liability, Current 0   0    
Derivative Liability, Noncurrent 0   0    
Cross Currency Interest Rate Contract [Member]          
Derivative, Notional Amount 570,349   574,315 $ 422,000 € 400
Derivative Asset, Current 2,242   211    
Derivative Liability, Current 144   127    
Derivative Asset, Noncurrent 7,669   7,669    
Derivative Liability, Noncurrent 29,442   40,870    
Interest Rate Swap [Member]          
Derivative Asset, Noncurrent 11,350   $ 14,967    
2018 Cross Currency Swaps [Member] | Cross Currency Interest Rate Contract [Member]          
Derivative, Notional Amount $ 184,000 € 160