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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Reclassification out of accumulated other comprehensive income) (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Reclassifications out of accumulated other comprehensive income
Cost of revenues	$ 110,034		$ 103,668		$ 218,120	$ 192,666
General and administrative	19,199		23,635		38,470	40,151
Sales and marketing	39,302		35,673		79,399	75,167
Research and development	99,329		87,152		191,534	173,578
Retained earnings and interest and other, net	(2,268)		338		(10,499)	871
Net income	$ (38,429)	$ (48,620)	$ (16,526)	$ (37,843)	(87,049)	(54,369)
Realized (Gains)/Losses Reclassified from Accumulated Other Comprehensive Income (Loss) \| Realized (gains)/losses on derivatives designated as hedging instruments
Reclassifications out of accumulated other comprehensive income
Cost of revenues and Operating expenses					(417)	884
Cost of revenues					(21)	45
General and administrative					(42)	78
Sales and marketing					(38)	81
Research and development					(316)	680
Realized (Gains)/Losses Reclassified from Accumulated Other Comprehensive Income (Loss) \| Realized (gains)/losses on available-for-sale securities
Reclassifications out of accumulated other comprehensive income
Retained earnings and interest and other, net					(1,311)	1
Realized (Gains)/Losses Reclassified from Accumulated Other Comprehensive Income (Loss) \| Accumulated Other Comprehensive Income (Loss)
Reclassifications out of accumulated other comprehensive income
Net income					$ (1,728)	$ 885