L. INCOME TAXES - RECONCILIATION (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Expected (benefit) taxes									$ 29,584	$ 7,351	$ 3,797
Non-deductible/non-taxable items									1,212	565	157
Foreign rate differences									(11,656)	(654)	(1,267)
Foreign permanent differences									416	(1,005)
Increase (decrease) in valuation allowance									(1,700)	(13,063)	2,052
Share based compensation									(10,348)
Section 382 limitation										(3,065)	(4,382)
Changes in tax laws or rates									2,768	(361)
Repatriation tax, net of foreign tax credit									5,067
Research and development credits									(2,821)
Uncertain tax positions									(1,616)
Other, net									(331)	1	18
Tax (benefit) expense	$ 3,703	$ (1,865)	$ 5,083	$ 3,654	$ 1,241	$ (11,332)	$ 52	$ (192)	$ 10,575	$ (10,231)	$ 375