FAIR VALUE MEASUREMENTS (Details) (USD $)	6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
Change in acquisition-related contingent consideration liabilities
Amortization of present value discount	$ (39,000)
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	557,800,000	556,700,000
Level 2 | Fair value | 11.5% Senior Secured Second Lien Notes
Change in acquisition-related contingent consideration liabilities
Notes	596,300,000	609,900,000
Recurring | Fair value
Assets
Cash equivalents	28,320,000	43,301,000
Total assets	28,320,000	43,301,000
Liabilities
Acquisition-related contingent considerations	576,000
Total liabilities	576,000	517,000
Change in acquisition-related contingent consideration liabilities
Balance at the beginning of the period	517,000
Amortization of present value discount	39,000
Fair value adjustment for change in consideration expected to be paid	20,000
Balance at the end of the period	576,000
Recurring | Level 1
Assets
Cash equivalents	28,320,000	43,301,000
Total assets	28,320,000	43,301,000
Recurring | Level 3
Liabilities
Acquisition-related contingent considerations	576,000	517,000
Total liabilities	576,000	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	$ 576,000	$ 517,000