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Long-Term Debt - Narrative (Details) - USD ($) |  |  | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 21, 2019 | Jun. 20, 2019 | Feb. 28, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Nov. 30, 2019 | Oct. 31, 2018 | Sep. 30, 2018
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Face value of long-term debt |  |  |  | $ 57,500,000 | $ 0 |  |  |  |
Repayments of long-term debt |  |  |  | 153,596,000 | 46,304,000 | $ 0 |  |  |
Gain on extinguishment of debt |  |  |  | 0 | 1,151,000 | $ 0 |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Face value of long-term debt |  |  |  | 57,500,000 | 0 |  |  |  |
Credit Facility [Member] | Revolving Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 600,000,000.0 |  |  |  |  |  | $ 225,000,000.0 |  |
Line of credit facility, current borrowing capacity | $ 300,000,000.0 |  |  |  |  |  |  | $ 350,000,000.0 | $ 425,000,000.0
Face value of long-term debt |  |  |  | 57,500,000 |  |  |  |  |
Letters of credit outstanding |  |  |  | $ 2,900,000 |  |  |  |  |
Line of credit facility, unused capacity, commitment fee percentage |  |  |  | 0.50% |  |  |  |  |
Interest rate during period |  |  |  | 4.70% |  |  |  |  |
Minimum collateral amount of proved oil and gas reserves representing the discounted present value of reserves used in borrowing base determination |  | 95.00% |  | 85.00% |  |  |  |  |
Ratio of indebtedness to assets |  |  |  | 3.50 |  |  |  |  |
Minimum consolidated interest coverage ratio |  |  |  | 2.25 |  |  |  |  |
Ratio of indebtedness to assets |  |  |  | 0.38 |  |  |  |  |
Interest coverage ratio |  |  |  | 37.89 |  |  |  |  |
Credit Facility [Member] | Revolving Credit Facility | Minimum | Base Rate |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 1.00% | 2.00% |  |  |  |  |  |  |
Credit Facility [Member] | Revolving Credit Facility | Minimum | LIBOR |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 2.00% | 3.00% |  |  |  |  |  |  |
Credit Facility [Member] | Revolving Credit Facility | Maximum | Base Rate |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 2.00% | 3.00% |  |  |  |  |  |  |
Credit Facility [Member] | Revolving Credit Facility | Maximum | LIBOR |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 3.00% | 4.00% |  |  |  |  |  |  |
New Building Note [Member] | Secured Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Repayments of long-term debt |  |  | $ 36,300,000 |  |  |  |  |  |
Repurchased face amount |  |  | 35,000,000.0 |  |  |  |  |  |
Paid-in-kind interest |  |  | $ 1,300,000 |  |  |  |  |  |
Gain on extinguishment of debt |  |  |  |  | $ 1,200,000 |  |  |  |

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