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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, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Income tax effect | $ (2,274) | $ 795 | $ (5,339) | $ 12,366
Net change in fair value of derivatives, net of tax | 15,920 | (5,565) | 37,372 | (86,559)
Interest rate swaps |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Effective portion of change in fair market value of derivatives | 17,656 | (5,904) | 39,943 | (93,682)
Interest rate caps |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Effective portion of change in fair market value of derivatives | (323) | (456) | 1,142 | (5,243)
Derivative Premium And Amortization |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Effective portion of change in fair market value of derivatives | $ 861 | $ 0 | $ 1,626 | $ 0

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