BALANCE SHEET COMPONENTS: (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016
Accounts receivable, net:
Accounts receivable, gross	$ 126,868	$ 142,400
Less: allowance for doubtful accounts	(632)	(632)
Accounts receivable, net	126,236	141,768
Inventories:
Raw materials	7,227	8,243
Work-in-process	28,579	26,118
Finished goods	39,541	31,162
Inventories	75,347	65,523
Other current assets:
Prepaid expenses	10,424	9,053
Derivative contracts receivable	3,398	257
VAT receivable	6,013	6,093
Other	3,172	1,943
Other current assets	23,007	17,346
Property and equipment, net:
Property and equipment, net	281,989	266,622
Less: Accumulated depreciation and amortization	(158,076)	(148,037)
Property and equipment, net	123,913	118,585
Deferred taxes and other long-term assets:
Equity investments in private companies	19,720	12,720
Deferred taxes	23,355	22,413
Other assets	6,827	1,580
Deferred taxes and other long-term assets	49,902	36,713
Accrued liabilities:
Payroll and related expenses	63,580	62,969
Accrued expenses	36,079	33,125
Derivative contracts payable	6	1,006
Product warranty liability	1,049	1,263	$ 1,432
Other	6,428	6,679
Accrued liabilities	107,142	105,042
Other long-term liabilities:
Income tax payable	24,553	24,184
Deferred rent	2,437	2,504
Other	4,527	3,892
Other long-term liabilities	31,517	30,580
Computer equipment, and software [Member]
Property and equipment, net:
Property and equipment, net	227,100	214,719
Furniture and fixtures {Member]
Property and equipment, net:
Property and equipment, net	5,270	5,210
Leasehold improvements [Member]
Property and equipment, net:
Property and equipment, net	$ 49,619	$ 46,693