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CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
CONSOLIDATED STATEMENTS OF CASH FLOWS        
Cash and cash equivalents $ 1,178,752 $ 668,770    
Restricted cash - current 458,334 526,723    
Restricted cash - non-current 2,629 9,927    
Total cash and cash equivalents, and restricted cash shown in the statements of cash flows $ 1,639,715 $ 1,205,420 $ 940,990 $ 1,190,134