FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)

6 Months Ended

Jun. 30, 2015

FAIR VALUE OF FINANCIAL INSTRUMENTS

Schedule of carrying amount and estimated fair value of financial instruments

	June 30, 2015				December 31, 2014
	Fair		Carrying		Fair		Carrying
	value		amount		value		amount
	(in thousands)
Financial assets
Collateral security account	$	2,812	$	2,812	$	3,165	$	3,165
Financial liabilities
Fixed rate debentures	$	3,045	$	1,636	$	3,035	$	1,636
Credit Facility	—		—		134,749		134,749
First Lien Credit Facility	219,665		219,665		—		—
Senior Notes	110,597		227,586		195,000		296,053
Contingent Earn-Out	6,800		6,800		6,530		6,530

Schedule of assets and liabilities, including both current and non-current portions, measured at fair value on a recurring basis

June  30, 2015

	Level 1		Level 2		Level 3		Total
	(in thousands)
Assets
Restricted investments in US Treasury Bonds — available for sale, at fair value	$	1,435	$	—	$	—	$	1,435

	Level 1		Level 2		Level 3		Total
	(in thousands)
Liabilities
Commodity derivatives	$	—	$	469	$	—	$	469

December 31, 2014

	Level 1		Level 2		Level 3		Total
	(in thousands)
Assets
Restricted investments in US Treasury Bonds — available for sale, at fair value	$	1,422	$	—	$	—	$	1,422
Commodity derivatives	$	—	$	4,005	$	—	$	4,005