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Other income (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Component of Operating Income [Abstract]        
Management fees $ 1,178 $ 2,397 $ 5,816 $ 5,807
Interest and other income 13,749 14,559 23,843 32,542
Total other income $ 14,927 $ 16,956 $ 29,659 $ 38,349