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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
May 01, 2019
Dec. 31, 2018
Dec. 31, 2017
Accounting Policies [Abstract]          
Cash and cash equivalents $ 720,662 $ 400,300      
Restricted cash included in:          
Other current assets 0 11,318      
Other assets 525 0      
Total cash, cash equivalents and restricted cash in the Statement of Cash Flows 721,187 $ 411,618 $ 74,009 $ 430,334 $ 311,300
Cash and cash equivalents available for general use $ 9,900