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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, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Income tax effect | $ (4,088) | $ (2,274) | $ (11,752) | $ (5,339)
Net gain on derivatives, net of tax | 28,613 | 15,920 | 82,261 | 37,372
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: | 25,774 | 17,656 | 76,524 | 39,943
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: | 5,753 | (323) | 15,148 | 1,142
Derivative Premium And Amortization |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Effective portion of change in fair market value of derivatives designated as accounting cash flow hedges: | $ 1,174 | $ 861 | $ 2,341 | $ 1,626

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- Definition 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 https://asc.fasb.org/extlink&oid=126968391&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=126968391&loc=SL7669646-108580 + Details
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- Definition Amount, before tax and after reclassification, of gain (loss) from derivative instrument designated and qualifying cash flow hedge included in assessment of hedge effectiveness, attributable to parent. + 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 https://asc.fasb.org/extlink&oid=126968391&loc=d3e637-108580 + Details
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