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Derivative financial instruments (Income (loss) recorded in comprehensive income) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Net changes in cash flow hedges, Income tax effect | $ 12,845 | $ 2,080 | $ (2,131)
Interest rate swaps |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Effective portion of change in fair market value of derivatives | (102,725) | (16,639) | 17,049
Net change in fair value of derivatives, net of tax | (89,918) | (14,559) | 14,918
Interest rate caps |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Effective portion of change in fair market value of derivatives | $ (38) | $ 0 | $ 0

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