Net (Loss) Income Per Share Calculation of basic and diluted net income (loss) per share attributable to common stockholders (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Numerator:
(Loss) income from continuing operations	$ (1,284)	$ 4,230	$ 276	$ 4,432
Gain (loss) from discontinued operations, net of tax	885	(837)	(2,113)	(2,165)
Net (loss) income	(399)	3,393	(1,837)	2,267
Less: Accrued dividend on Series B mandatorily redeemable convertible preferred stock plus an 8% non-cumulative dividend on Series A and Series C mandatorily redeemable convertible preferred stock	0	0	0	294
Net (loss) income attributable to common stockholders	$ (399)	$ 3,393	$ (1,837)	$ 1,973
Denominator:
Weighted average common shares outstanding- basic (in shares)	24,895	23,411	25,151	20,641
Weighted average common shares outstanding- diluted (in shares)	25,243	25,838	25,570	23,006
Net (loss) income per share – basic
Continuing operations -basic (in dollars per share)	$ (0.05)	$ 0.18	$ 0.00	$ 0.20
Discontinued operations, basic (in dollars per share)	$ 0.03	$ (0.04)	$ (0.08)	$ (0.10)
Net (loss) income per share attributable to common stockholders (in dollars per share)	$ (0.02)	$ 0.14	$ (0.08)	$ 0.10
Net (loss) income per share – diluted
Continuing operations, diluted (in dollars per share)	$ (0.05)	$ 0.17	$ 0.00	$ 0.19
Discontinued operations, diluted (in dollars per share)	$ 0.03	$ (0.04)	$ (0.08)	$ (0.10)
Net (loss) income per share attributable to common stockholders (in dollars per share)	$ (0.02)	$ 0.13	$ (0.08)	$ 0.09