OTHER CONSOLIDATED BALANCE SHEET COMPONENTS (CURRENT) - Other Current Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Inventory, net	$ 54,719	$ 47,683
Restricted cash	34,315	38,873	$ 33,220
Processing costs receivable	84,045	67,281
Prepaid expenses	31,433	22,758
Accounts receivable, net	31,515	33,863
Other	42,643	39,951
Total	$ 278,670	$ 250,409