Fair Value Measurements - Schedule of Positions Measured at Fair Value (Details) - USD ($)
|
Jun. 30, 2018 |
Dec. 31, 2017 |
| Financial assets |
|
|
| Commodity derivative asset - current |
$ 22,727,000
|
$ 433,000
|
| Commodity derivative asset - noncurrent |
0
|
662,000
|
| Financial liabilities |
|
|
| Commodity derivative liability - current |
0
|
240,000
|
| Commodity derivative liability - noncurrent |
2,857,000
|
0
|
| Fair Value, Measurements, Recurring |
|
|
| Financial assets |
|
|
| Netting Adjustments |
(2,886,000)
|
(287,000)
|
| Total financial assets |
22,727,000
|
1,095,000
|
| Financial liabilities |
|
|
| Netting Adjustments |
(2,886,000)
|
|
| Total financial liabilities |
2,857,000
|
|
| Fair Value, Measurements, Recurring | Level 1 |
|
|
| Financial assets |
|
|
| Derivative asset, gross |
0
|
0
|
| Financial liabilities |
|
|
| Derivative liability, gross |
0
|
|
| Fair Value, Measurements, Recurring | Level 2 |
|
|
| Financial assets |
|
|
| Derivative asset, gross |
25,613,000
|
1,382,000
|
| Financial liabilities |
|
|
| Derivative liability, gross |
5,743,000
|
|
| Fair Value, Measurements, Recurring | Level 3 |
|
|
| Financial assets |
|
|
| Derivative asset, gross |
0
|
0
|
| Financial liabilities |
|
|
| Derivative liability, gross |
0
|
|
| Current assets | Fair Value, Measurements, Recurring |
|
|
| Financial assets |
|
|
| Netting Adjustments |
(1,264,000)
|
(287,000)
|
| Commodity derivative asset - current |
22,727,000
|
433,000
|
| Current assets | Fair Value, Measurements, Recurring | Level 1 |
|
|
| Financial assets |
|
|
| Derivative asset, gross |
0
|
0
|
| Current assets | Fair Value, Measurements, Recurring | Level 2 |
|
|
| Financial assets |
|
|
| Derivative asset, gross |
23,991,000
|
720,000
|
| Current assets | Fair Value, Measurements, Recurring | Level 3 |
|
|
| Financial assets |
|
|
| Derivative asset, gross |
0
|
0
|
| Noncurrent assets | Fair Value, Measurements, Recurring |
|
|
| Financial assets |
|
|
| Netting Adjustments |
(1,622,000)
|
0
|
| Commodity derivative asset - noncurrent |
0
|
662,000
|
| Noncurrent assets | Fair Value, Measurements, Recurring | Level 1 |
|
|
| Financial assets |
|
|
| Derivative asset, gross |
0
|
0
|
| Noncurrent assets | Fair Value, Measurements, Recurring | Level 2 |
|
|
| Financial assets |
|
|
| Derivative asset, gross |
1,622,000
|
662,000
|
| Noncurrent assets | Fair Value, Measurements, Recurring | Level 3 |
|
|
| Financial assets |
|
|
| Derivative asset, gross |
0
|
0
|
| Current liabilities | Fair Value, Measurements, Recurring |
|
|
| Financial liabilities |
|
|
| Netting Adjustments |
(1,264,000)
|
(287,000)
|
| Commodity derivative liability - current |
0
|
240,000
|
| Current liabilities | Fair Value, Measurements, Recurring | Level 1 |
|
|
| Financial liabilities |
|
|
| Derivative liability, gross |
0
|
0
|
| Current liabilities | Fair Value, Measurements, Recurring | Level 2 |
|
|
| Financial liabilities |
|
|
| Derivative liability, gross |
1,264,000
|
527,000
|
| Current liabilities | Fair Value, Measurements, Recurring | Level 3 |
|
|
| Financial liabilities |
|
|
| Derivative liability, gross |
0
|
$ 0
|
| Noncurrent liabilities | Fair Value, Measurements, Recurring |
|
|
| Financial liabilities |
|
|
| Netting Adjustments |
(1,622,000)
|
|
| Commodity derivative liability - noncurrent |
2,857,000
|
|
| Noncurrent liabilities | Fair Value, Measurements, Recurring | Level 1 |
|
|
| Financial liabilities |
|
|
| Derivative liability, gross |
0
|
|
| Noncurrent liabilities | Fair Value, Measurements, Recurring | Level 2 |
|
|
| Financial liabilities |
|
|
| Derivative liability, gross |
4,479,000
|
|
| Noncurrent liabilities | Fair Value, Measurements, Recurring | Level 3 |
|
|
| Financial liabilities |
|
|
| Derivative liability, gross |
$ 0
|
|