COMMITMENTS AND CONTINGENCIES: (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Future minimum payments under non-cancelable operating leases
2017 due in remaining nine months	$ 17,050
2018	18,569
2019	13,553
2020	11,466
2021	8,093
Thereafter	10,388
Total minimum lease payments	79,119
Purchase commitments
2017 due in remaining nine months	116,229
2018	3,400
2019	610
2020	154
2021	51
Thereafter	0
Amount of non-cancelable purchase commitments	120,444
Loss Contingencies [Line Items]
Total minimum lease payments	$ 79,119
Royalties payable, percentage	4.50%
Accrued royalties	$ 35,800
Unrecognized tax benefits	42,000	$ 41,500
Unrecognized tax benefits that would impact effective tax rate	25,100
Yokneam [Member]
Future minimum payments under non-cancelable operating leases
Total minimum lease payments	$ 2,900
Loss Contingencies [Line Items]
Length of operating lease term	10 years
Present value of capital lease obligations	$ 29,300
Total minimum lease payments	2,900
Tel Aviv [Member]
Future minimum payments under non-cancelable operating leases
Total minimum lease payments	53,900
Loss Contingencies [Line Items]
Total minimum lease payments	53,900
Estimated rental expense	$ 5,400