UNAUDITED QUARTERLY FINANCIAL INFORMATION (Details) (USD $)	3 Months Ended									12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012		Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Quarterly financial information [Abstract]
Total revenue	$ 92,636,000	$ 80,354,000	$ 79,464,000	$ 77,945,000	$ 84,349,000	$ 79,624,000	$ 66,403,000	[1]	$ 65,247,000	$ 330,399,000	$ 295,623,000	$ 267,474,000
Total cost of goods sold	37,613,000	36,515,000	37,293,000	37,940,000	39,171,000	37,938,000	27,682,000	[1]	27,344,000
Net (loss) income	9,373,000	(4,156,000)	(6,107,000)	(15,437,000)	(12,269,000)	(17,859,000)	23,649,000	[1]	(4,217,000)	(16,327,000)	(10,696,000)	(28,161,000)
Basic net (loss) income per common share (in dollars per share)	$ 0.13	$ (0.06)	$ (0.09)	$ (0.22)	$ (0.17)	$ (0.25)	$ 0.34	[1]	$ (0.06)
Diluted net (loss) income per common share (in dollars per share)	$ 0.11	$ (0.06)	$ (0.09)	$ (0.22)	$ (0.17)	$ (0.25)	$ 0.33	[1]	$ (0.06)
Income Tax (Benefit) provision acquisition adjustment		7,200,000
Income tax (benefit) provision related to acquisition before recast							44,300,000
Income tax (benefit) provision related to acquisition after recast						$ 37,100,000

[1] During the third quarter of 2012, the Company recast its income tax benefit for the second quarter of 2012, lowering it by $7.2 million from net $44.3 million to net $37.1 million with a corresponding increase in valuation allowance as a result of the retrospective adjustments related to the determination of the fair value of assets acquired and liabilities assumed and related income tax valuation adjustments.