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Restricted cash (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash and Cash Equivalents [Abstract]        
Cash and cash equivalents $ 1,204,018 $ 1,659,669    
Restricted cash 211,017 364,456    
Total cash, cash equivalents and restricted cash $ 1,415,035 $ 2,024,125 $ 2,364,627 $ 2,822,545