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BASIS OF PRESENTATION - Reconciliation of Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
May 01, 2019
Dec. 31, 2018
Accounting Policies [Abstract]          
Cash and cash equivalents $ 713,728 $ 400,300      
Restricted cash included in:          
Other current assets 10,876 11,318      
Other assets 525 0      
Total cash, cash equivalents and restricted cash in the Statement of Cash Flows $ 725,129 $ 411,618 $ 288,337 $ 74,009 $ 430,334