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Derivative financial instruments (Income (loss) recorded in comprehensive income) (Details) - Interest rate swaps - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Effective portion of change in fair market value of derivatives	$ (66,778)	$ 7,531	$ (107,516)	$ 32,355
Net changes in cash flow hedges, Income tax effect	8,348	(941)	13,440	(4,044)
Net changes in cash flow hedges, net of tax	$ (58,430)	$ 6,590	$ (94,076)	$ 28,311

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Amount before tax, after reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss), attributable to parent entity.

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