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Derivatives and Hedging Activities - Narrative (Details)
$ in Thousands, € in Millions, £ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Feb. 04, 2015
EUR (€)
Feb. 04, 2015
GBP (£)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Dec. 31, 2015
USD ($)
Jun. 30, 2017
€ / $
Jun. 30, 2017
EUR (€)
Jun. 30, 2017
£ / $
Jun. 30, 2017
GBP (£)
Apr. 01, 2017
USD ($)
Apr. 01, 2017
EUR (€)
Apr. 01, 2017
GBP (£)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
EUR (€)
Dec. 31, 2016
GBP (£)
Feb. 04, 2015
GBP (£)
Derivative Instruments, Gain (Loss) [Line Items]                                    
Borrowings under credit facility         $ 75,335 $ 0                        
Gain (loss) on derivatives due to ineffectiveness in earnings     $ 30 $ (500) 100 (500)                        
Line of credit, amount drawn     722,108   722,108                   $ 616,614      
Gain on derivative, from partial settlement             $ 19,000                      
Proceeds from termination of derivatives             10,100                      
Portion of derivative termination proceeds used to repay debt             $ 8,900                      
Foreign currency derivative instruments, liability fair value     500,500   500,500             $ 584,900            
Foreign currency exchange rate               1.14   1.30                
Foreign currency derivative instruments, asset fair value                         € 358.8 £ 110.7        
Foreign currency derivative instruments, fair value | £                           66.6        
Gain (loss) on foreign currency fair value hedge ineffectiveness     (3,000) 4,300 (3,900) 4,200                        
Gains (loss) on derivative instruments     (2,990) 3,830 (3,460) 3,481                        
Fair value of derivatives in net liability position     13,200   13,200                          
GBP                                    
Derivative Instruments, Gain (Loss) [Line Items]                                    
Foreign currency derivative instruments, asset fair value                       143,900            
Foreign currency derivative instruments, fair value                       86,500            
EUR                                    
Derivative Instruments, Gain (Loss) [Line Items]                                    
Foreign currency derivative instruments, asset fair value | €                         409.8          
Not Designated as Hedging Instrument                                    
Derivative Instruments, Gain (Loss) [Line Items]                                    
Gains (loss) on derivative instruments     (3,000) $ 3,800 $ (3,500) $ 3,500                        
Cash Flow Hedging | Interest Expense | Interest rate swaps, net (GBP & EUR) | Designated as Hedging Instrument                                    
Derivative Instruments, Gain (Loss) [Line Items]                                    
Estimate of time to transfer (months)         12 months                          
Estimated amount to be reclassified from OCI         $ 5,600                          
Revolving Credit Facility                                    
Derivative Instruments, Gain (Loss) [Line Items]                                    
Line of credit, amount drawn € 110.5                                 £ 68.5
Revolving Credit Facility | JPMorgan Chase Bank, N.A.                                    
Derivative Instruments, Gain (Loss) [Line Items]                                    
Borrowings under credit facility € 110.5 £ 68.5                                
Line of credit, amount drawn     722,100   722,100       € 255.7   £ 160.2   € 310.2 £ 177.2 $ 616,600 € 258.9 £ 177.2  
Revolving Credit Facility | JPMorgan Chase Bank, N.A. | GBP | Individual Investment                                    
Derivative Instruments, Gain (Loss) [Line Items]                                    
Line of credit, amount drawn     208,400   208,400             230,500            
Revolving Credit Facility | JPMorgan Chase Bank, N.A. | EUR | Individual Investment                                    
Derivative Instruments, Gain (Loss) [Line Items]                                    
Line of credit, amount drawn     $ 292,100   $ 292,100             $ 354,400