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Stock-Based Compensation | 12 Months Ended
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Dec. 31, 2019
Share-based Payment Arrangement, Noncash Expense [Abstract] |
Stock-Based Compensation | STOCK-BASED COMPENSATION The Company adopted the 2005 Stock Incentive Plan ("2005 Plan") in January 2005. The 2005 Plan was amended and restated in April 2013 with the 2013 Restated Stock Incentive Plan ("2013 Plan"). During 2019, the Company further amended and restated the 2013 Plan with the 2019 Amended and Restated Stock Incentive Plan ("2019 Plan"). The 2019 Plan provides for grants of options, stock appreciation rights, restricted awards (restricted stock and restricted stock units) and performance awards to employees, consultants and directors of the Company that, in aggregate, do not exceed 12,500,000 shares. The 2019 Plan is administered by the Compensation Committee of the Company's board of directors (the "Committee"). Among other responsibilities, the Committee selects individuals to receive awards and establishes the terms of awards. As of December 31, 2019, the Company has awarded 8,673,254 restricted stock units and 2,009,144 performance vesting restricted stock units under the 2019 Plan. During the years ended December 31, 2019, 2018 and 2017 the Company’s stock-based compensation cost was $10.7 million, $11.3 million and $10.6 million, respectively, of which the Company capitalized $5.8 million, $4.5 million and $4.2 million, respectively, relating to its exploration and development efforts. Stock compensation costs, net of the amounts capitalized, are included in general and administrative expenses in the accompanying consolidated statements of operations. The following table summarizes restricted stock unit and performance vesting restricted stock unit activity for the twelve months ended December 31, 2019, 2018 and 2017:
| Number of Unvested Restricted Stock Units |  | Weighted Average Grant Date Fair Value |  | Number of Unvested Performance Vesting Restricted Stock Units |  | Weighted Average Grant Date Fair Value
Unvested shares as of January 1, 2017 | 613,056 |  |  | $ | 32.90 |  |  | $ | — |  |  | $ | — |
Granted | 876,846 |  |  | 15.14 |  |  | — |  |  | — |
Vested | (423,977 | ) |  | 29.90 |  |  | — |  |  | — |
Forfeited | (89,898 | ) |  | 27.91 |  |  | — |  |  | — |
Unvested shares as of December 31, 2017 | 976,027 |  |  | $ | 18.71 |  |  | $ | — |  |  | $ | — |
Granted | 1,579,911 |  |  | $ | 9.90 |  |  | $ | — |  |  | $ | — |
Vested | (626,671 | ) |  | 18.05 |  |  | — |  |  | — |
Forfeited | (393,456 | ) |  | 12.23 |  |  | — |  |  | — |
Unvested shares as of December 31, 2018 | 1,535,811 |  |  | $ | 11.57 |  |  | $ | — |  |  | $ | — |
Granted | 4,011,073 |  |  | 3.74 |  |  | 2,009,144 |  |  | 2.85 |
Vested | (676,108 | ) |  | 12.89 |  |  | — |  |  | — |
Forfeited | (772,458 | ) |  | 6.05 |  |  | (225,484 | ) |  | 1.98 |
Unvested shares as of December 31, 2019 | 4,098,318 |  |  | $ | 4.73 |  |  | 1,783,660 |  |  | $ | 2.96 |
Restricted Stock Units Restricted stock units awarded under the 2019 Plan generally vest over a period of one year in the case of directors and three years in the case of employees and vesting is dependent upon the recipient meeting applicable service requirements. Stock-based compensation costs are recorded ratably over the service period. The grant date fair value of restricted stock units represents the closing market price of the Company's common stock on the date of grant. Unrecognized compensation expense as of December 31, 2019 related to outstanding restricted stock units was $14.6 million. The expense is expected to be recognized over a weighted average period of 2.10 years. Performance Vesting Restricted Stock Units During the year ended December 31, 2019, the Company awarded performance vesting restricted stock units to certain of its executive officers under the 2019 Plan. The number of shares of common stock issued pursuant to the award will be based on relative total shareholder return ("RTSR"). RTSR is an incentive measure whereby participants will earn from 0% to 200% of the target award based on the Company’s RTSR ranking compared to the RTSR of the companies in the Company’s designated peer group at the end of the performance period. Awards will be earned and vested over a performance period measured from January 1, 2019 to December 31, 2021, subject to earlier termination of the performance period in the event of a change in control. The grant date fair value was determined using the Monte Carlo simulation method and is being recorded ratably over the performance period. Expected volatilities utilized in the Monte Carlo model were estimated using a historical period consistent with the remaining performance period of approximately two years. The risk-free interest rates were based on the U.S. Treasury rate for a term commensurate with the expected life of the grant. The Company assumed a range of risk-free interest rates of 1.56% to 2.42% and a range of expected volatilities of 29.1% to 85.1% to estimate the fair value of performance vesting units granted during the year ended December 31, 2019. Unrecognized compensation expense as of December 31, 2019 related to performance vesting restricted stock units was $4.2 million. The expense is expected to be recognized over a weighted average period of 2.38 years.

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- Definition The entire disclosure for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 + Details
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