INCOME TAXES (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred income tax assets:
Net operating losses	$ 31,402	$ 37,634
Research and development, foreign tax and other tax credits	71,381	55,408
Accrued liabilities	26,534	37,380
Fixed assets	49,067	54,348
Intangible assets	10,103	11,977
Deferred income	10,648	10,319
Share-based compensation	2,590	3,291
Unrealized foreign exchange translation	3,854	2,424
Other	1,307	2,363
Total deferred income tax assets	206,886	215,144
Deferred income tax liabilities:
Foreign losses subject to recapture	(11,510)	(12,164)
Total deferred tax liabilities	(11,510)	(12,164)
Less valuation allowance	(37,579)	(40,372)
Reported as:
Current deferred tax assets	0	45,518
Current deferred tax liabilities	0	(182)
Non-current deferred tax assets	157,929	117,278
Non-current deferred tax liabilities	(132)	(6)
Net deferred income tax assets	$ 157,797	$ 162,608