Derivative Instruments (Tables)

6 Months Ended

Jun. 30, 2018

Summary of Outstanding Contracts with Respect to Natural Gas

At June 30, 2018 the Company had outstanding natural gas derivative contracts as set forth in the table below. The volumes reflected below represent an aggregation of multiple derivative contracts having similar remaining durations expected to be realized ratably over the remainder of 2018. At June 30, 2018 the Company had no outstanding crude oil derivative contracts.

		Swaps Weighted Average Price
Period and Type of Contract	MMBtus
July 2018 - December 2018
Swaps - Henry Hub	115,920,000	$	2.88

Realized and Unrealized Gains and Losses on Derivative Instruments

Cash receipts and payments in the following table reflect the gain or loss on derivative contracts which matured during the period, calculated as the difference between the contract price and the market settlement price of matured contracts. Non-cash gains and losses below represent the change in fair value of derivative instruments which continue to be held at period end and the reversal of previously recognized non-cash gains or losses on derivative contracts that matured during the period.

	Three months ended June 30,						Six months ended June 30,
In thousands	2018			2017			2018			2017
Cash received (paid) on derivatives:
Natural gas fixed price swaps	$	4,758		$	6,709		$	8,954		$	12,187
Natural gas collars	—			(3,050		)	—			(9,456		)
Cash received (paid) on derivatives, net	4,758			3,659			8,954			2,731
Non-cash gain (loss) on derivatives:
Natural gas fixed price swaps	(17,443		)	12,520			(11,465		)	35,416
Natural gas collars	—			11,843			—			36,733
Non-cash gain (loss) on derivatives, net	(17,443		)	24,363			(11,465		)	72,149
Gain (loss) on natural gas derivatives, net	$	(12,685	)	$	28,022		$	(2,511	)	$	74,880

Gross Amounts of Recognized Derivative Assets and Liabilities

The following table presents the gross amounts of recognized natural gas and diesel fuel derivative assets and liabilities, as applicable, the amounts offset under netting arrangements with counterparties, and the resulting net amounts presented in the condensed consolidated balance sheets for the periods presented, all at fair value.

In thousands	June 30, 2018			December 31, 2017
Commodity derivative assets:
Gross amounts of recognized assets	$	885		$	2,603
Gross amounts offset on balance sheet	(682		)	—
Net amounts of assets on balance sheet	203			2,603
Commodity derivative liabilities:
Gross amounts of recognized liabilities	(9,747		)	—
Gross amounts offset on balance sheet	682			—
Net amounts of liabilities on balance sheet	$	(9,065	)	$	—

Reconciles Net Amounts Derivative Assets and Liabilities

The following table reconciles the net amounts disclosed above to the individual financial statement line items in the condensed consolidated balance sheets.

In thousands	June 30, 2018			December 31, 2017
Derivative assets	$	203		$	2,603
Noncurrent derivative assets	—			—
Net amounts of assets on balance sheet	203			2,603
Derivative liabilities	(9,065		)	—
Noncurrent derivative liabilities	—			—
Net amounts of liabilities on balance sheet	(9,065		)	—
Total derivative assets (liabilities), net	$	(8,862	)	$	2,603

Diesel Fuel [Member]

Realized and Unrealized Gains and Losses on Derivative Instruments

Cash receipts in the following table reflect gains on diesel fuel derivatives which matured during the 2017 period, calculated as the difference between the contract price and the market settlement price of matured contracts. Non-cash losses below represent the change in fair value of diesel fuel derivatives held at June 30, 2017 and the reversal of previously recognized non-cash gains or losses on derivative contracts that matured during the three and six months ended June 30, 2017.

	Three months ended June 30,					Six months ended June 30,
In thousands	2018		2017			2018		2017
Cash received on diesel fuel derivatives	$	—	$	185		$	—	$	919
Non-cash loss on diesel fuel derivatives	—		(1,098		)	—		(3,729		)
Loss on diesel fuel derivatives, net	$	—	$	(913	)	$	—	$	(2,810	)