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Derivative Activities (Tables) | 6 Months Ended
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Jun. 30, 2018
Derivative Instruments And Hedging Activities Disclosure [Abstract] |
Derivative Volumes Hedged and Average Hedge Prices | The following table sets forth our commodity-based derivative volumes by year as of June 30, 2018, excluding our basis and freight swaps which are discussed separately below:
Period |  | Contract Type |  | Volume Hedged |  | Weighted Average Hedge Price
Natural Gas |  |  |  |  |  |  |  |
2018 |  | Swaps |  | 1,246,739 Mmbtu/day |  |  | $ 2.96 |
2019 |  | Swaps |  | 514,589 Mmbtu/day |  |  | $ 2.81 |
October-December 2018 |  | Calls |  | 70,000 Mmbtu/day |  |  | $ 3.10 (1) |
2018 |  | Swaptions |  | 160,000 Mmbtu/day |  |  | $ 3.07 (2) |
2019 |  | Swaptions |  | 317,945 Mmbtu/day |  |  | $ 2.86 (2) |
2020 |  | Swaptions |  | 10,000 Mmbtu/day |  |  | $ 2.75 (2) |
Crude Oil |  |  |  |  |  |  |  |
2018 |  | Swaps |  | 8,500 bbls/day |  |  | $ 53.20 |
2019 |  | Swaps |  | 6,624 bbls/day |  |  | $ 54.57 |
January-June 2020 |  | Swaps |  | 1,000 bbls/day |  |  | $ 57.00 |
January-March 2019 |  | Collars |  | 250 bbls/day |  |  | $ 63.00 − $ 73.00 |
NGLs (C2-Ethane) |  |  |  |  |  |  |  |
July-September 2018 |  | Swaps |  | 1,000 bbls/day |  |  | $ 0.30/gallon |
NGLs (C3-Propane) |  |  |  |  |  |  |  |
2018 |  | Swaps |  | 10,918 bbls/day |  |  | $ 0.71/gallon |
NGLs (NC4-Normal Butane) |  |  |  |  |  |  |  |
2018 |  | Swaps |  | 4,250 bbls/day |  |  | $ 0.81/gallon |
NGLs (C5-Natural Gasoline) |  |  |  |  |  |  |  |
2018 |  | Swaps |  | 5,152 bbls/day |  |  | $ 1.23/gallon |
2019 |  | Swaps |  | 1,244 bbls/day |  |  | $ 1.30/gallon |
(1) | Weighted average deferred premium of $0.16.
(2) | Contains a combined derivative instrument consisting of a fixed price swap and a sold option to extend or double the volume. For July through December of 2018, we have swaps in place for 160,000 Mmbtu per day on which the counterparty can elect to extend the contract through December 2019 at a weighted average price of $3.07. We have swaps in place for 2019 for 220,000 Mmbtu/day on which the counterparty can elect to double the volume at a weighted average price of $2.89. We also have swaps in place for 2019 for 130,000 Mmbtu per day on which the counterparty can elect to extend the contract through December 2020 at a weighted average price of $2.81. For 2020, we have swaps in place for 10,000 Mmbtu/day on which the counterparty can elect to double the volume at a weighted average price of $2.75.
Combined Fair Value of Derivatives, by Consolidated Balance Sheets | The combined fair value of derivatives included in the accompanying consolidated balance sheets as of June 30, 2018 and December 31, 2017 is summarized below. The assets and liabilities are netted where derivatives with both gain and loss positions are held by a single counterparty and we have master netting arrangements. The tables below provide additional information relating to our master netting arrangements with our derivative counterparties (in thousands):
|  |  | June 30, 2018 |
|  |  | Gross Amounts of Recognized Assets |  |  | Gross Amounts Offset in the Balance Sheet |  |  | Net Amounts of Assets Presented in the Balance Sheet |
Derivative assets: |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas | –swaps |  | $ | 11,332 |  |  | $ | (8,481 | ) |  | $ | 2,851 |
| –swaptions |  |  | 14,045 |  |  |  | (12,511 | ) |  |  | 1,534 |
| –basis swaps |  |  | 846 |  |  |  | (667 | ) |  |  | 179 |
Crude oil | –swaps |  |  | — |  |  |  | (1,269 | ) |  |  | (1,269 | )
| −collars |  |  | 12 |  |  |  | (12 | ) |  |  | — |
NGLs | –C3 propane spread swaps |  |  | 17,193 |  |  |  | (17,193 | ) |  |  | — |
Freight | −swaps |  |  | 166 |  |  |  | (166 | ) |  |  | — |
|  |  | $ | 43,594 |  |  | $ | (40,299 | ) |  | $ | 3,295 |
|  |  | June 30, 2018 |
|  |  | Gross Amounts of Recognized (Liabilities) |  |  | Gross Amounts Offset in the Balance Sheet |  |  | Net Amounts of (Liabilities) Presented in the Balance Sheet |
Derivative (liabilities): |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas | –swaps |  | $ | (12,764 | ) |  | $ | 8,481 |  |  | $ | (4,283 | )
| –swaptions |  |  | (14,530 | ) |  |  | 12,511 |  |  |  | (2,019 | )
| –basis swaps |  |  | (2,754 | ) |  |  | 667 |  |  |  | (2,087 | )
| –calls |  |  | (701 | ) |  |  | — |  |  |  | (701 | )
Crude oil | –swaps |  |  | (52,493 | ) |  |  | 1,269 |  |  |  | (51,224 | )
| −collars |  |  | — |  |  |  | 12 |  |  |  | 12 |
NGLs | −C2 ethane swaps |  |  | (85 | ) |  |  | — |  |  |  | (85 | )
| –C3 propane swaps |  |  | (22,591 | ) |  |  | — |  |  |  | (22,591 | )
| –C3 propane spread swaps |  |  | (19,306 | ) |  |  | 17,193 |  |  |  | (2,113 | )
| –NC4 butane swaps |  |  | (8,906 | ) |  |  | — |  |  |  | (8,906 | )
| –C5 natural gasoline swaps |  |  | (17,585 | ) |  |  | — |  |  |  | (17,585 | )
Freight | –swaps |  |  | — |  |  |  | 166 |  |  |  | 166 |
|  |  | $ | (151,715 | ) |  | $ | 40,299 |  |  | $ | (111,416 | )
|  |  | December 31, 2017 |
|  |  | Gross Amounts of Recognized Assets |  |  | Gross Amounts Offset in the Balance Sheet |  |  | Net Amounts of Assets Presented in the Balance Sheet |
Derivative assets: |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas | –swaps |  | $ | 87,794 |  |  | $ | (4,106 | ) |  | $ | 83,688 |
| –swaptions |  |  | 18,817 |  |  |  | (8,103 | ) |  |  | 10,714 |
| –basis swaps |  |  | 1,815 |  |  |  | (6,673 | ) |  |  | (4,858 | )
| –collars |  |  | 3,039 |  |  |  | (500 | ) |  |  | 2,539 |
Crude oil | –swaps |  |  | 2 |  |  |  | (7,928 | ) |  |  | (7,926 | )
NGLs | –C2 ethane swaps |  |  | 57 |  |  |  | — |  |  |  | 57 |
| –C3 propane swaps |  |  | — |  |  |  | (12,556 | ) |  |  | (12,556 | )
| –C3 propane collars |  |  | 85 |  |  |  | (85 | ) |  |  | — |
| –C3 propane spread swaps |  |  | 12,762 |  |  |  | (12,762 | ) |  |  | — |
| –NC4 butane swaps |  |  | — |  |  |  | (6,051 | ) |  |  | (6,051 | )
| –C5 natural gasoline swaps |  |  | — |  |  |  | (6,727 | ) |  |  | (6,727 | )
Freight | –swaps |  |  | 276 |  |  |  | (276 | ) |  |  | — |
|  |  | $ | 124,647 |  |  | $ | (65,767 | ) |  | $ | 58,880 |
|  |  | December 31, 2017 |
|  |  | Gross Amounts of Recognized (Liabilities) |  |  | Gross Amounts Offset in the Balance Sheet |  |  | Net Amounts of (Liabilities) Presented in the Balance Sheet |
Derivative (liabilities): |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas | –swaps |  | $ | (216 | ) |  | $ | 4,106 |  |  | $ | 3,890 |
| –swaptions |  |  | (12,283 | ) |  |  | 8,103 |  |  |  | (4,180 | )
| –basis swaps |  |  | (9,580 | ) |  |  | 6,673 |  |  |  | (2,907 | )
| –collars |  |  | — |  |  |  | 500 |  |  |  | 500 |
Crude oil | –swaps |  |  | (24,726 | ) |  |  | 7,928 |  |  |  | (16,798 | )
NGLs | –C3 propane swaps |  |  | (34,325 | ) |  |  | 12,556 |  |  |  | (21,769 | )
| –C3 propane collars |  |  | — |  |  |  | 85 |  |  |  | 85 |
| –C3 propane spread swaps |  |  | (13,983 | ) |  |  | 12,762 |  |  |  | (1,221 | )
| –NC4 butane swaps |  |  | (11,188 | ) |  |  | 6,051 |  |  |  | (5,137 | )
| –C5 natural gasoline swaps |  |  | (13,488 | ) |  |  | 6,727 |  |  |  | (6,761 | )
Freight | –swaps |  |  | — |  |  |  | 276 |  |  |  | 276 |
|  |  | $ | (119,789 | ) |  | $ | 65,767 |  |  | $ | (54,022 | )
Effects of Derivatives on Consolidated Statements of Operations | The effects of our derivatives on our consolidated statements of operations are summarized below (in thousands):
| Derivative Fair Value (Loss) Income |
|  | Three Months Ended June 30, |  |  |  | Six Months Ended June 30, |
| 2018 |  |  |  | 2017 |  |  |  | 2018 |  |  |  | 2017 |
Commodity swaps | $ | (91,195 | ) |  | $ | 93,567 |  |  | $ | (107,730 | ) |  | $ | 260,319 |
Swaptions |  | (6,592 | ) |  |  | — |  |  |  | (2,993 | ) |  |  | — |
Collars |  | 11 |  |  |  | 4,790 |  |  |  | (66 | ) |  |  | 14,265 |
Puts |  | — |  |  |  | 3,012 |  |  |  | — |  |  |  | 9,719 |
Calls |  | 152 |  |  |  | 529 |  |  |  | 329 |  |  |  | 1,040 |
Basis swaps |  | (5,828 | ) |  |  | 9,304 |  |  |  | (6,693 | ) |  |  | (8,668 | )
Freight swaps |  | 162 |  |  |  | (7 | ) |  |  | (146 | ) |  |  | 77 |
Total | $ | (103,290 | ) |  | $ | 111,195 |  |  | $ | (117,299 | ) |  | $ | 276,752 |

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