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Derivative Instruments (Tables)
 6 Months Ended
Jun. 30, 2017
Summary of Outstanding Contracts with Respect to Natural Gas
At June 30, 2017, 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 that are expected to be realized ratably over the respective 2017 and 2018 periods. At June 30, 2017 the Company had no outstanding crude oil derivative contracts.
 
 
 
 
 
 
Collars
Natural Gas - NYMEX Henry Hub
 
Swaps Weighted Average Price
 
Floors
 
Ceilings
 
 
 
 
 
 
 
Weighted Average Price
 
 
 
Weighted Average Price
Period and Type of Contract
 
MMBtus
 
 
Range
 
 
Range
 
July 2017 - December 2017
 
 
 
 
 
 
 
 
 
 
 
 
Swaps - Henry Hub
 
66,240,000

 
$
3.39

 
 
 
 
 
 
 
 
Collars - Henry Hub
 
33,120,000

 
 
 
$2.40 - $3.00
 
$
2.47

 
$2.92 - $3.88
 
$
3.08

January 2018 - March 2018
 
 
 
 
 
 
 
 
 
 
 
 
Swaps - Henry Hub
 
6,300,000

 
$
3.28

 
 
 
 
 
 
 
 
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
 
2017
 
2016
 
2017
 
2016
Cash received (paid) on derivatives:
 
 
 
 
 
 
 
 
Natural gas fixed price swaps
 
$
6,709

 
$
38,778

 
$
12,187

 
$
77,967

Natural gas collars
 
(3,050
)
 
—

 
(9,456
)
 
—

Cash received on derivatives, net
 
3,659

 
38,778

 
2,731

 
77,967

Non-cash gain (loss) on derivatives:
 
 
 
 
 
 
 
 
Crude oil written call options
 
—

 
6

 
—

 
38

Natural gas fixed price swaps
 
12,520

 
(101,308
)
 
35,416

 
(98,915
)
Natural gas collars
 
11,843

 
(19,733
)
 
36,733

 
(19,235
)
Non-cash gain (loss) on derivatives, net
 
24,363

 
(121,035
)
 
72,149

 
(118,112
)
Gain (loss) on crude oil and natural gas derivatives, net
 
$
28,022

 
$
(82,257
)
 
$
74,880

 
$
(40,145
)
Gross Amounts of Recognized Derivative Assets and Liabilities
The following table presents the gross amounts of recognized crude oil, natural gas, and diesel fuel derivative assets and liabilities, 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, 2017
 
December 31, 2016
Commodity derivative assets:
 
 
 
 
Gross amounts of recognized assets
 
$
19,746

 
$
4,061

Gross amounts offset on balance sheet
 
(1,937
)
 
—

Net amounts of assets on balance sheet
 
17,809

 
4,061

Commodity derivative liabilities:
 
 
 
 
Gross amounts of recognized liabilities
 
(6,754
)
 
(59,489
)
Gross amounts offset on balance sheet
 
1,937

 
—

Net amounts of liabilities on balance sheet
 
$
(4,817
)
 
$
(59,489
)
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, 2017
 
December 31, 2016
Derivative assets
 
$
17,809

 
$
4,061

Noncurrent derivative assets
 
—

 
—

Net amounts of assets on balance sheet
 
17,809

 
4,061

Derivative liabilities
 
(4,817
)
 
(59,489
)
Noncurrent derivative liabilities
 
—

 
—

Net amounts of liabilities on balance sheet
 
(4,817
)
 
(59,489
)
Total derivative assets (liabilities), net
 
$
12,992

 
$
(55,428
)
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 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 diesel fuel derivatives 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
 
2017
 
2016
 
2017
 
2016
Cash received on diesel fuel derivatives
 
$
185

 
$
—

 
$
919

 
$
—

Non-cash gain (loss) on diesel fuel derivatives
 
(1,098
)
 
4,200

 
(3,729
)
 
3,140

Gain (loss) on diesel fuel derivatives, net
 
$
(913
)
 
$
4,200

 
$
(2,810
)
 
$
3,140