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

Other income (Details)

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Other income (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Component of Operating Income [Abstract]      
Management fees $ 12,445 $ 14,539 $ 13,426
Interest and other income 53,794 47,025 81,172
Total other income $ 66,239 $ 61,564 $ 94,598