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Supplemental Cash Flow Information of the Company - Reconciliation of Cash and Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
RECONCILIATION OF CASH AND CASH EQUIVALENTS AND RESTRICTED CASH:        
Cash and cash equivalents $ 762,134 $ 60,044 $ 49,693 $ 51,604
Restricted cash 16,300 16,300 6,300 119,430
Cash and cash equivalents and restricted cash $ 778,434 $ 76,344 $ 55,993 $ 171,034