ACQUISITION -Unaudited Supplemental Financial Information (Details 2) (Voxel Holdings Inc, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Voxel Holdings Inc
Business Acquisition [Line Items]
Unaudited pro forma revenue	$ 257,999	$ 254,409
Unaudited pro forma net loss	$ (12,241)	$ (2,820)	[1]

[1] The 2010 unaudited pro forma net loss includes a nonrecurring deferred tax benefit recorded as a result of Voxel purchase accounting. The $6.1 million deferred tax liability resulted in a deferred tax benefit once consolidated with our balance sheet, as it lowered our consolidated net deferred tax asset resulting in the release of our valuation allowance.