FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)

12 Months Ended

Dec. 31, 2015

FAIR VALUE OF FINANCIAL INSTRUMENTS

Schedule of fair value and carrying amount of financial instruments

	2015				2014
	Fair value		Carrying amount		Fair value		Carrying amount
	(in thousands)
Financial assets:
Collateral Security account	$	2,812	$	2,812	$	3,165	$	3,165
US Treasury Bonds		1,448		1,636		1,422		1,636
Derivatives		11,081		11,081		4,005		4,005
Financial liabilities:
Fixed rate debentures		3,057		1,636		3,035		1,636
Line of credit		—		—		134,749		134,749
First Lien Credit Facility		234,665		234,665		—		—
Second Lien Credit Facility		74,912		74,912		—		—
Senior Notes		25,090		165,368		195,000		296,053
Contingent Earn-Out		7,070		7,070		6,530		6,530

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

December 31, 2015	Level 1		Level 2		Level 3		Total
	(in thousands)
Assets
Restricted investments in US Treasury Bonds—available for sale, at fair value	$	1,448	$	—	$	—	$	1,448
Commodity derivatives	$	—	$	11,081	$	—	$	11,081

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