INCOME TAXES (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			24 Months Ended	48 Months Ended	60 Months Ended	24 Months Ended	60 Months Ended	72 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012	Dec. 31, 2011 State of Illinois [Member]	Dec. 31, 2012 U.S. Federal [Member]	Dec. 31, 2012 Other U.S. state and local juristictions [Member]	Dec. 31, 2012 United Kingdon [Member]	Dec. 31, 2012 Australia [Member]	Dec. 31, 2012 Other Jurisdictions [Member]
Tax open years subject to examination [Line Items]
Open Tax Year					2009	2008	2011	2008	2007
Income Tax Examination, Year under Examination				2010
Income tax benefit (provision)	$ (177)	$ (646)
Pre-tax income (loss)	(8,418)	(3,867)
Effective income tax rate	2.10%	16.70%
Unrecognized tax benefits	3,848		3,845
Accrued interest and penalties	711		701
Estimated interest and penalties benefit	19	(97)
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change, Lower Bound	140
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change, Upper Bound	$ 350