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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Details Textual) | 12 Months Ended |
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Dec. 31, 2019 USD ($) | Dec. 31, 2019 USD ($) shares | Dec. 31, 2019 USD ($) $ / MMBTU | Dec. 31, 2019 USD ($) $ / bbl | Dec. 31, 2019 USD ($) Purchasers | Dec. 31, 2019 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) shares | Dec. 31, 2018 USD ($) $ / MMBTU | Dec. 31, 2018 USD ($) $ / bbl | Dec. 31, 2018 USD ($) Purchasers | Dec. 31, 2018 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 shares | Dec. 31, 2017 $ / MMBTU | Dec. 31, 2017 $ / bbl | Dec. 31, 2017 Purchasers | Dec. 31, 2017 | Dec. 31, 2017 USD ($) | Jan. 01, 2019 USD ($)
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
RIght-of-use asset | $ 85,668,000 | $ 85,668,000 | $ 85,668,000 | $ 85,668,000 | $ 85,668,000 | $ 85,668,000 | $ 85,668,000 |  |  |  |  |  |  |  |  |  |  |  |  | $ 62,300,000
Lease liability | $ 91,623,000 | 91,623,000 | 91,623,000 | 91,623,000 | 91,623,000 | 91,623,000 | 91,623,000 |  |  |  |  |  |  |  |  |  |  |  |  | $ 62,300,000
Billing date | 30 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding days of account receivable | 60 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 |  |  |  |  |  |  |
Number of purchasers | Purchasers |  |  |  |  | 2 |  |  |  |  |  | 4 |  |  |  |  |  | 4 |  |  |
Capitalized general and administrative costs |  |  |  |  |  |  | 31,100,000 |  |  |  |  |  | 28,300,000 |  |  |  |  |  | $ 23,100,000 |
Capitalized interest expense |  |  |  |  |  |  | 7,600,000 |  |  |  |  |  | 8,800,000 |  |  |  |  |  | 7,300,000 |
Depletion |  |  |  |  |  |  | 330,700,000 |  |  |  |  |  | 251,800,000 |  |  |  |  |  | 170,300,000 |
Present value discounted percent of future net revenues of proved oil and natural gas reserves |  |  |  |  |  | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average oil and natural gas prices |  |  | 2.58 | 52.19 |  |  |  |  | 3.10 | 62.04 |  |  |  |  | 2.98 | 47.79 |  |  |  |
Impairment charge of net capitalized costs |  |  |  |  |  |  | 0 |  |  |  |  |  | 0 |  |  |  |  |  | 0 |
Stock-based compensation (non-cash) expense |  |  |  |  |  |  | 18,505,000 |  |  |  |  |  | 17,200,000 |  |  |  |  |  | 16,654,000 |
Common stock and restricted stock unit expense |  |  |  |  |  |  | 1,400,000 |  |  |  |  |  | 1,600,000 |  |  |  |  |  | $ 3,000,000.0 |
Compensation expense, liability-based awards |  |  |  |  |  |  | 3,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable due period | 30 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contract term after production | 1 month |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable due period | 60 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contract term after production | 2 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales Revenue, Goods, Net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk, percentage |  |  |  |  |  | 67.00% |  |  |  |  |  | 60.00% |  |  |  |  |  | 60.00% |  |
Accounts Receivable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk, percentage |  |  |  |  |  | 31.00% |  |  |  |  |  | 34.00% |  |  |  |  |  | 43.00% |  |
Plains Marketing, L.P. | Customer Concentration Risk | Sales Revenue, Goods, Net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk, percentage |  |  |  |  |  | 53.00% |  |  |  |  |  | 19.00% |  |  |  |  |  | 14.00% |  |
BP America Production Company | Customer Concentration Risk | Sales Revenue, Goods, Net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk, percentage |  |  |  |  |  | 14.00% |  |  |  |  |  | 15.00% |  |  |  |  |  |  |  |
Occidental Energy Marketing, Inc. | Customer Concentration Risk | Sales Revenue, Goods, Net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk, percentage |  |  |  |  |  | 14.00% |  |  |  |  |  |  |  |  |  |  |  | 23.00% |  |
Western Refining Oil | Customer Concentration Risk | Sales Revenue, Goods, Net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk, percentage |  |  |  |  |  |  |  |  |  |  |  | 12.00% |  |  |  |  |  | 11.00% |  |
Shell Trading (US) Company | Customer Concentration Risk | Sales Revenue, Goods, Net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk, percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12.00% |  |
Machinery and Equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capitalized general and administrative costs |  |  |  |  |  |  | 1,800,000 |  |  |  |  |  | $ 1,600,000 |  |  |  |  |  |  |
Capitalized interest expense |  |  |  |  |  |  | $ 900,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Useful life using the straight-line | 30 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Machinery and Equipment | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Useful life | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Machinery and Equipment | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Useful life | 30 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee Stock Options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive options excluded from calculation (in shares) | shares |  | 2,600,000 |  |  |  |  |  | 1,600,000 |  |  |  |  |  | 1,000,000.0 |  |  |  |  |  |

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