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BASIS OF PRESENTATION - Reconciliation of Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Accounting Policies [Abstract]        
Cash and cash equivalents $ 529,134 $ 720,662    
Restricted cash included in:        
Other assets 524 525    
Total cash, cash equivalents and restricted cash in the Statement of Cash Flows $ 529,658 $ 721,187 $ 658,117 $ 411,618