FAIR VALUE MEASUREMENTS (Tables)

6 Months Ended

Jun. 30, 2013

Fair Value Disclosures [Abstract]

Assets and Liabilities Measured at Fair Value on Recurring Basis

The Company’s assets and liabilities measured at fair value on a recurring basis consisted of the following as of the date indicated:

	Fair Value Measurement as of June 30, 2013
	Total		Level 1		Level 2		Level 3
	(in thousands)
Restricted investments, current	$	7,250	$	7,250	$	—	$	—
Restricted investments, noncurrent		557		557
Total assets	$	7,807	$	7,807	$	—	$	—

	Fair Value Measurement as of December 31, 2012
	Total		Level 1		Level 2		Level 3
	(in thousands)
Restricted investments	$	—	$	—	$	—	$	—
Total assets	$	—	$	—	$	—	$	—

	Fair Value Measurement as of June 30, 2013
	Total		Level 1		Level 2		Level 3
	(in thousands)
Warrants*	$	79,116	$	—	$	—	$	79,116
Total liabilities	$	79,116	$	—	$	—	$	79,116

	Fair Value Measurement as of December 31, 2012
	Total		Level 1		Level 2		Level 3
	(in thousands)
Warrants*	$	65,193	$	—	$	—	$	65,193
Total liabilities	$	65,193	$	—	$	—	$	65,193

* See Note 5 for additional information related to the determination of fair value of warrants and a reconciliation of changes in fair value.