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Derivative financial instruments (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Breakdown of fair value amount of derivative financial instruments [Abstract]      
Loss on cash flow hedges $ 43,792 $ 41,062  
Cash Flow Hedge [Member]      
Breakdown of fair value amount of derivative financial instruments [Abstract]      
Assets 2,381   $ 5,230
Liabilities $ 322,130   298,744
Interest Rate Derivatives [Member] | Euros [Member]      
Breakdown of fair value amount of derivative financial instruments [Abstract]      
Percent of notional amount of debt hedged in next 12 months 100.00%    
Percentage of notional amount of debt hedged in year two 75.00%    
Interest Rate Derivatives [Member] | Cash Flow Hedge [Member]      
Breakdown of fair value amount of derivative financial instruments [Abstract]      
Assets $ 1,270   1,619
Liabilities 313,416   298,744
Loss on cash flow hedges (43,800) $ (41,100)  
After-tax result accumulated in equity 81,500   73,800
Foreign Exchange Derivative Instruments [Member] | Cash Flow Hedge [Member]      
Breakdown of fair value amount of derivative financial instruments [Abstract]      
Assets 1,111   3,610
Liabilities 0   0
Notes Conversion Option [Member] | Cash Flow Hedge [Member]      
Breakdown of fair value amount of derivative financial instruments [Abstract]      
Assets 0   0
Liabilities $ 8,714   $ 0