CONSOLIDATED FINANCIAL STATEMENT DETAILS - Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Cash and cash equivalents	$ 398,884	$ 465,676	$ 366,447	$ 186,947
Restricted cash included in other current assets	132	127	125	193
Cash, cash equivalents, and restricted cash included in current assets of discontinued operations	0	2,674,146	2,581,178	1,946,125
Restricted cash included in non-current assets of discontinued operations	0	409	403	420
Total cash, cash equivalents, and restricted cash as shown on the consolidated statement of cash flows	$ 399,016	$ 3,140,358	$ 2,948,153	$ 2,133,685