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

Derivative financial instruments (Effects of derivatives recorded in interest expense) (Details)

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Derivative financial instruments (Effects of derivatives recorded in interest expense) (Details) - Interest Rate Caps And Swaps - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]      
Derivatives not designated as hedges $ (29,714) $ 5,158 $ (14,178)
Reclassification to Consolidated Income Statements:      
Reclassification of amounts previously recorded in AOCI 3,381 6,874 0
Effect from derivatives $ (26,333) $ 12,032 $ (14,178)