Physical Delivery Contracts and Gas Derivatives (Tables)

6 Months Ended

Jun. 30, 2018

Derivatives, Fair Value [Line Items]

Schedule of swap derivative agreements

	Natural Gas Swaps				Natural Gas Collars				Oil Swaps
			Weighted				Weighted				Weighted
			Average				Average Price				Average
Year	MMBtu		Price (a)		MMBtu		Range (a)		Bbl		Price (b)
2018		1,740,000	$	3.00		-		-		35,500	$	53.23
2019		2,596,000	$	2.86		-		-		48,000	$	53.76

(a) NYMEX Henry Hub Natural Gas futures contract for the respective period.

(b) NYMEX Light Sweet Crude West Texas Intermediate futures contract for the respective period.

Schedule of fair value of the derivatives recorded

(in thousands)
	June 30,  2018		December 31,  2017
Commodity derivative contracts:
Commodity derivative asset	$	-	$	215
Other long-term assets	$	-	$	10
Commodity derivative liabilities	$	4,570	$	-
Commodity derivative liabilities, non-current	$	3,447	$	-

Schedule of realized and unrealized gains and losses

(in thousands)	For the three months ended June 30,					For the six months ended June 30,
	2018			2017		2018			2017
Commodity derivative contracts:
Settlement (loss) gain	$	(674	)	$	142	$	(1,060	)	$	118
Unrealized (loss) gain		(5,348	)		856		(5,587	)		3,023
Total settlement and unrealized (loss) gain, net	$	(6,022	)	$	998	$	(6,647	)	$	3,141

Schedule of fair value amounts of all derivative instruments assets and liabilities

 The following table summarizes the location and fair value amounts of all derivative instruments in the unaudited consolidated balance sheets, as well as the gross recognized derivative assets, liabilities and amounts offset in the unaudited consolidated balance sheets as of June 30, 2018.

								Net
		Gross						Recognized
		Recognized			Gross			Fair Value
		Assets/			Amounts			Assets/
	Balance Sheet Classification	Liabilities			Offset			Liabilities
Commodity derivative assets:	Commodity derivative	$	272		$	(272	)	$	-
	Other long-term assets		181			(181	)		-
Total derivative assets		$	453		$	(453	)	$	-
Commodity derivative liabilities:
	Commodity derivative	$	(4,842	)	$	272		$	(4,570	)
	Commodity derivative: non-current		(3,628	)		181			(3,447	)
Total derivative liabilities		$	(8,470	)	$	453		$	(8,017	)

The following table summarizes the location and fair value amounts of all derivative instruments in the consolidated balance sheets, as well as the gross recognized derivative assets, liabilities and amounts offset in the consolidated balance sheets as of December 31, 2017.

								Net
		Gross						Recognized
		Recognized			Gross			Fair Value
		Assets/			Amounts			Assets/
	Balance Sheet Classification	Liabilities			Offset			Liabilities
Commodity derivative assets:	Commodity derivative	$	624		$	(409	)	$	215
	Other long-term assets		250			(240	)		10
Total derivative assets		$	874		$	(649	)	$	225
Commodity derivative liabilities:
	Commodity derivative	$	(409	)	$	409		$	-
	Commodity derivative: non-current		(240	)		240			-
Total derivative liabilities		$	(649	)	$	649		$	-

Carbon California [Member]

Derivatives, Fair Value [Line Items]

Schedule of swap derivative agreements

	Natural Gas Swaps				Natural Gas Collars				Oil Swaps
			Weighted				Weighted				Weighted				Weighted
			Average				Average Price		WTI		Average		Brent		Average
Year	MMBtu		Price (a)		MMBtu		Range (a)		Bbl		Price (b)		Bbl		Price (c)
2018		180,000	$	3.03		-		-		85,809	$	53.20		110,598	$	66.78
2019		-	$	-		360,000		$2.60 - $3.03		139,797	$	51.77		137,486	$	66.35
2020		-	$	-		-		-		73,147	$	50.12		123,882	$	63.03
2021		-	$	-		-		-		-	$	-		28,641	$	66.35

(a) NYMEX Henry Hub Natural Gas futures contract for the respective period.

(b) NYMEX Light Sweet Crude West Texas Intermediate futures contract for the respective period.

(c) Brent future contracts for the respective period.