L. INCOME TAXES - PROVISION FOR INCOME TAX EXPENSE (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
Current:
Federal										$ (15)	$ 168
State									$ (292)	256	207
Foreign									10,965	962
Total									10,673	1,203	375
Deferred:
Federal									2,015	(10,794)
State									(1,669)	(130)
Foreign									(444)	(510)
Total									(98)	(11,434)
Tax (benefit) expense	$ 3,703	$ (1,865)	$ 5,083	$ 3,654	$ 1,241	$ (11,332)	$ 52	$ (192)	$ 10,575	$ (10,231)	$ 375