COMMITMENTS AND CONTINGENCIES - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Leases
Expenses related to office space and motor vehicle leases	$ 21,300	$ 18,900	$ 14,300
Future minimum payments under non-cancelable operating leases
2018	23,028
2019	18,453
2020	14,740
2021	12,950
2022	9,648
Thereafter	60,091
Total minimum lease payments	138,910
Purchase commitments
2018	153,358
2019	2,447
2020	544
2021	542
2022	536
Thereafter	0
Total purchase commitments	$ 157,427
Loss Contingencies [Line Items]
Royalties payable, percentage	4.50%
Royalty guarantees, commitments, amount	$ 36,400
Unrecognized tax benefits	45,154	41,460	25,382	$ 18,037
Unrecognized tax benefits that would impact effective tax rate	$ 24,600	$ 23,400	$ 18,900
Yokneam
Loss Contingencies [Line Items]
Operating lease term	10 years
Estimated future lease obligation	$ 30,700
Rental expense	$ 3,100