SELECTED QUARTERLY FINANCIAL DATA Selected Quarterly Financial Data (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]
Revenue	$ 136,677	$ 149,278	$ 151,070	$ 144,167	$ 139,999	$ 139,287	$ 145,383	$ 137,903	$ 581,192	[1]	$ 562,572	[1]	$ 655,875	[1]
Gross margin	53,258	55,687	59,871	54,029	52,838	50,491	55,106	50,994	222,845		209,429		257,793
Operating income (loss)	(6,134)	(5,113)	(2,865)	(3,374)	(6,447)	(6,125)	(5,941)	(8,639)	(17,486)		(27,152)		(10,094)
Income (Loss) from Continuing Operations	(3,539)	(4,570)	(3,565)	(4,112)	(10,327)	(5,584)	(6,293)	(8,007)	(15,786)		(30,211)		(7,222)
Net income (loss)	$ 2,743	$ (7,019)	$ (4,374)	$ (4,544)	$ (11,295)	$ (5,047)	$ (5,811)	$ (8,242)	$ (13,194)		$ (30,395)		$ (5,335)
Earnings (loss) per share from continuing operations, basic and diluted	$ (0.11)	$ (0.14)	$ (0.11)	$ (0.13)	$ (0.32)	$ (0.17)	$ (0.19)	$ (0.25)	$ (0.48)		$ (0.93)		$ (0.22)
Earnings (loss) per share from discontinued operations, basic and diluted	$ 0.19	$ (0.07)	$ (0.02)	$ (0.01)	$ (0.03)	$ 0.02	$ 0.01	$ 0.00	$ 0.08		$ (0.01)		$ 0.05
Earnings Per Share, Basic and Diluted	$ 0.08	$ (0.21)	$ (0.13)	$ (0.14)	$ (0.35)	$ (0.15)	$ (0.18)	$ (0.25)	$ (0.40)		$ (0.94)		$ (0.17)
Weighted Average Number of Shares Outstanding, Basic and Diluted	32,995,000	32,910,000	32,752,000	32,641,000	32,600,000	32,600,000	32,717,000	32,344,000	32,843,000		32,493,000		32,600,000
Weighted-average common stock outstanding - diluted (in shares)									32,843,000		32,493,000		32,600,000
Common stock equivalents and outstanding stock options excluded from the calculation of diluted earnings (loss) per share (in thousands)	1,681,000	1,176,000	1,207,000	1,274,000	1,914,000	2,191,000	1,972,000	1,725,000	1,680,739		1,914,021		2,367,566

[1] Revenue by geographic region disclosed above is net of any inter-segment revenue and, therefore, represents only revenue from external customers according to the location of the operating subsidiary.