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BASIS OF PRESENTATION - Reconciliation of Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
May 01, 2019
Dec. 31, 2018
Accounting Policies [Abstract]          
Cash and cash equivalents $ 517,684 $ 400,300      
Restricted cash included in:          
Other current assets 11,349 11,318      
Total cash, cash equivalents and restricted cash in the Statement of Cash Flows $ 529,033 $ 411,618 $ 138,750 $ 74,009 $ 430,334