Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Derivative financial instruments (Income (loss) recorded in comprehensive income) (Details)

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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