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Derivative financial instruments (Income (loss) recorded in comprehensive income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Derivative premium and amortization	$ 3,437	$ 1,597	$ 0
Net loss on derivatives, tax	(11,679)	8,402	12,845
Net gain (loss) on derivatives, net of tax	81,751	(58,814)	(89,918)
Interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Effective portion of change in fair market value of derivatives designated as accounting cash flow hedges	87,800	(62,967)	(102,725)
Interest rate caps
Derivative Instruments, Gain (Loss) [Line Items]
Effective portion of change in fair market value of derivatives designated as accounting cash flow hedges	$ 2,193	$ (5,846)	$ (38)

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Other Comprehensive Income (Loss), Cash Flow Hedge, Premium and Amortization, before Tax, Portion Attributable to Parent

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Amount, after tax and reclassification, of gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=124509347&loc=d3e637-108580

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Amount, before tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=124509347&loc=d3e689-108580

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Amount of tax expense (benefit) for reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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