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Derivative financial instruments (Income (loss) recorded in comprehensive income) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Net changes in cash flow hedges, Income tax effect	$ 795	$ 8,348	$ 12,366	$ 13,440
Net change in fair value of derivatives, net of tax	(5,565)	(58,430)	(86,559)	(94,076)
Interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Effective portion of change in fair market value of derivatives	(5,904)	(66,778)	(93,682)	(107,516)
Interest rate caps
Derivative Instruments, Gain (Loss) [Line Items]
Effective portion of change in fair market value of derivatives	$ (456)	$ 0	$ (5,243)	$ 0

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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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Amount after tax and 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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Amount of tax expense (benefit), 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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