FAIR VALUE MEASUREMENTS (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Change in acquisition-related contingent consideration liabilities
Amortization of present value discount	$ (19,000)
11.5% Senior Secured Second Lien Notes
Change in acquisition-related contingent consideration liabilities
Interest rate (as a percent)	11.50%	11.50%
Carrying value | 11.5% Senior Secured Second Lien Notes
Change in acquisition-related contingent consideration liabilities
Notes	557,200,000	556,700,000
Level 2 | Fair value | 11.5% Senior Secured Second Lien Notes
Change in acquisition-related contingent consideration liabilities
Notes	592,100,000	609,900,000
Recurring | Fair value
Assets
Cash equivalents	43,312,000	43,301,000
Total assets	43,312,000	43,301,000
Liabilities
Acquisition-related contingent considerations	542,000
Total liabilities	542,000	517,000
Change in acquisition-related contingent consideration liabilities
Balance at the beginning of the period	517,000
Amortization of present value discount	19,000
Fair value adjustment for change in consideration expected to be paid	6,000
Balance at the end of the period	542,000
Recurring | Level 1
Assets
Cash equivalents	43,312,000	43,301,000
Total assets	43,312,000	43,301,000
Recurring | Level 3
Liabilities
Acquisition-related contingent considerations	542,000	517,000
Total liabilities	542,000	517,000
Change in acquisition-related contingent consideration liabilities
Balance at the beginning of the period		517,000
Balance at the end of the period	$ 542,000	$ 517,000