SELECTED QUARTERLY FINANCIAL DATA Selected Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]
Revenue	$ 106,109	$ 110,028	$ 122,743	$ 124,317	$ 136,677	$ 149,278	$ 151,070	$ 144,167	$ 463,197	$ 581,192	$ 562,572
Gross margin	44,439	45,145	50,222	47,904	53,258	55,687	59,871	54,029	187,710	222,845	209,429
Operating income (loss)	140	(3,826)	13,643	(6,716)	(6,134)	(5,113)	(2,865)	(3,374)	3,241	(17,486)	(27,152)
Income (Loss) from Continuing Operations	(2,484)	(2,029)	12,774	(6,654)	(3,539)	(4,570)	(3,565)	(4,112)	1,607	(15,786)	(30,211)
Income (Loss) from Discontinued Operations, Net of Taxes	(142)	(55)	1,103	(184)	6,282	(2,449)	(809)	(432)	722	2,592	(184)
Net income (loss)	$ (2,626)	$ (2,084)	$ 13,877	$ (6,838)	$ 2,743	$ (7,019)	$ (4,374)	$ (4,544)	$ 2,329	$ (13,194)	$ (30,395)
Earnings (loss) per share from continuing operations, basic and diluted	$ (0.07)	$ (0.06)	$ 0.38	$ (0.20)	$ (0.11)	$ (0.14)	$ (0.11)	$ (0.13)	$ 0.05	$ (0.48)	$ (0.93)
Earnings (loss) per share from discontinued operations, basic and diluted	0.00	0.00	0.03	(0.01)	0.19	(0.07)	(0.02)	(0.01)	0.02	0.08	(0.01)
Earnings Per Share, Basic and Diluted	$ (0.08)	$ (0.06)	$ 0.41	$ (0.21)	$ 0.08	$ (0.21)	$ (0.13)	$ (0.14)	$ 0.07	$ (0.40)	$ (0.94)
Weighted Average Number of Shares Outstanding, Basic	34,274,000	34,687,000	33,525,000	33,053,000					33,869,000	32,843,000	32,493,000
Weighted Average Number of Shares Outstanding, Basic and Diluted					32,995,000	32,910,000	32,752,000	32,641,000
Weighted-average common stock outstanding - diluted (in shares)	34,274,000	34,687,000	34,007,000	33,053,000					34,084,000	32,843,000	32,493,000
Common stock equivalents and outstanding stock options excluded from the calculation of diluted earnings (loss) per share (in thousands)	886,000	1,124,000	979,000	1,903,000	1,681,000	1,176,000	1,207,000	1,274,000	556,000	1,680,739	1,914,021