EARNINGS (LOSS) PER SHARE (Computation of basic and diluted earnings (loss) per share) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Basic
Income (loss) from continuing operations (in dollars per share)									$ (0.17)		$ 0.35		$ (0.15)
Income (loss) from discontinued operations (in dollars per share)									$ 0.00		$ 0.00		$ (0.01)
Net income (loss) - basic (in dollars per share)	$ (0.01)	$ (0.07)	$ 0.01	$ (0.10)	$ 0.10	$ 0.11	$ 0.13	$ 0.00	$ (0.17)		$ 0.35		$ (0.16)
Diluted
Income (loss) from continuing operations (in dollars per share)									$ (0.17)		$ 0.34		$ (0.15)
Income (loss) from discontinued operations (in dollars per share)									$ 0.00		$ 0.00		$ (0.01)
Net income (loss) - diluted (in dollars per share)	$ (0.01)	$ (0.07)	$ 0.01	$ (0.10)	$ 0.10	$ 0.11	$ 0.13	$ 0.00	$ (0.17)		$ 0.34		$ (0.16)
EPS numerator - basic and diluted:
Income (loss) from continuing operations									$ (5,335)		$ 10,909		$ (4,441)
Income (loss) from discontinued operations, net of income taxes									0		0		(244)
Net income (loss)	$ (343)	$ (2,165)	$ 394	$ (3,221)	$ 3,309	$ 3,382	$ 4,224	$ (6)	$ (5,335)		$ 10,909		$ (4,685)
EPS denominator (in thousands):
Weighted-average common stock outstanding - basic (in shares)	32,169	32,156	32,122	31,765	31,639	31,620	31,593	31,325	32,060		31,566		29,931
Common stock equivalents: stock options and other stock-based awards (a) (in shares)									0	[1]	423	[1]	0	[1]
Weighted-average number of common stock outstanding - diluted (in shares)	32,169	32,156	32,486	31,765	32,118	32,085	32,039	31,325	32,060		31,989		29,931

[1] For the periods in which net losses are presented, the diluted weighted average number of shares of common stock outstanding did not differ from the basic weighted average number of shares of common stock outstanding because the effects of any potential common stock equivalents (see Note 4 for further details on outstanding stock options, unvested restricted stock units and unvested restricted stock) were anti-dilutive and therefore not included in the calculation of the denominator of dilutive earnings per share.