Details Of Certain Accounts - Other Current Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Contract assets	$ 360	$ 2,446
Prepaids	15,289	15,904
Deferred costs	18,717	23,522
Income tax receivable	13,847	20,787
Other receivable	30,052	29,782
Other	7,977	9,651
Total other current assets	$ 86,242	$ 102,092