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Compensation Plans | 9 Months Ended
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Sep. 30, 2021
Share-based Payment Arrangement [Abstract] |
Compensation Plans | Note 7 - Compensation Plans As of September 30, 2021, 4.2 million shares of common stock were available for grant under the Company’s Equity Incentive Compensation Plan (“Equity Plan”). The Company may also grant other types of long-term incentive-based awards, such as cash awards and performance-based cash awards, to eligible employees under its compensation plan. Performance Share Units The Company has granted performance share units (“PSUs”) to eligible employees as part of its Equity Plan. The number of shares of the Company’s common stock issued to settle PSUs ranges from zero to two times the number of PSUs awarded and is determined based on certain criteria over a three-year performance period. PSUs generally vest on the third anniversary of the date of the grant or upon other triggering events as set forth in the Equity Plan. For PSUs granted in 2018 and 2019, the settlement criteria include a combination of the Company’s Total Shareholder Return (“TSR”) relative to the TSR of certain peer companies and the Company’s cash return on total capital invested (“CRTCI”) relative to the CRTCI of certain peer companies over the associated three-year performance period. In addition to these performance criteria, the award agreements for these grants also stipulate that if the Company’s absolute TSR is negative over the three-year performance period, the maximum number of shares of common stock that can be issued to settle outstanding PSUs is capped at one times the number of PSUs granted on the award date, regardless of the Company’s TSR and CRTCI performance relative to its peer group. The fair values of the PSUs granted in 2018 and 2019 were measured on the applicable grant dates using the GBM Model, with the assumption that the associated CRTCI performance condition will be met at the target amount at the end of the respective performance periods. Compensation expense for PSUs is recognized within general and administrative expense and exploration expense over the vesting periods of the respective awards. As these awards depend on a combination of performance-based settlement criteria and market-based settlement criteria, compensation expense may be adjusted in future periods as the number of units expected to vest increases or decreases based on the Company’s expected CRTCI performance relative to the applicable peer companies. The Company records compensation expense associated with the issuance of PSUs based on the fair value of the awards as of the date of grant. Total compensation expense recorded for PSUs was $0.8 million and $1.6 million for the three months ended September 30, 2021, and 2020, respectively, and $5.3 million and $7.0 million for the nine months ended September 30, 2021, and 2020, respectively. As of September 30, 2021, there was $2.2 million of total unrecognized compensation expense related to non-vested PSUs, which is being amortized through 2022. A summary of activity during the nine months ended September 30, 2021, is presented in the following table:
| PSUs (1) |  | Weighted-Average Grant-Date Fair Value
Non-vested at beginning of year | 830,464 |  | $ | 17.52 |
Granted | — |  | $ | — |
Vested | (352,395) |  | $ | 23.81 |
Forfeited | (12,222) |  | $ | 15.76 |
Non-vested at end of quarter | 465,847 |  | $ | 12.80 |
____________________________________________ (1) The number of shares of common stock assumes a multiplier of one. The actual final number of shares of common stock to be issued will range from zero to two times the number of PSUs awarded depending on the three-year performance multiplier. During the nine months ended September 30, 2021, the Company settled PSUs that were granted in 2018, which earned a 1.0 times multiplier. The Company and all eligible recipients mutually agreed to net share settle a portion of the awards to cover income and payroll tax withholdings, as provided for in the Equity Plan and applicable award agreements. After withholding 112,919 shares to satisfy income and payroll tax withholding obligations, 234,823 shares of the Company’s common stock were issued in accordance with the terms of the applicable award agreement. Employee Restricted Stock Units The Company grants restricted stock units (“RSUs”) to eligible persons as part of its Equity Plan. Each of the RSUs granted represents a right to receive one share of the Company’s common stock upon settlement of the award at the end of the specified vesting period. RSUs generally vest one-third of the total grant on each anniversary date of the grant over the applicable vesting period or upon other triggering events as set forth in the Equity Plan. The Company records compensation expense associated with the issuance of RSUs based on the fair value of the awards as of the date of grant. The fair value of an individual RSU is equal to the closing price of the Company’s common stock on the date of the grant. Compensation expense for RSUs is recognized within general and administrative expense and exploration expense over the vesting periods of the respective awards. Total compensation expense recorded for employee RSUs was $2.9 million and $1.8 million for the three months ended September 30, 2021, and 2020, respectively, and $7.2 million and $7.1 million for the nine months ended September 30, 2021, and 2020, respectively. As of September 30, 2021, there was $23.7 million of total unrecognized compensation expense related to non-vested RSUs, which is being amortized through 2024. A summary of activity during the nine months ended September 30, 2021, is presented in the following table:
| RSUs |  | Weighted-Average Grant-Date Fair Value
Non-vested at beginning of year | 2,097,860 |  | $ | 8.83 |
Granted | 661,402 |  | $ | 25.47 |
Vested | (394,930) |  | $ | 16.69 |
Forfeited | (67,619) |  | $ | 10.25 |
Non-vested at end of quarter | 2,296,713 |  | $ | 12.23 |
During the nine months ended September 30, 2021, the Company settled RSUs upon the vesting of awards granted in previous years. The Company and all eligible recipients mutually agreed to net share settle a portion of the awards to cover income and payroll tax withholdings, as provided for in the Equity Plan and applicable award agreements. After withholding 106,543 shares to satisfy income and payroll tax withholding obligations, 268,114 shares of the Company’s common stock were issued in accordance with the terms of the applicable award agreements. Director Shares During the second quarters of 2021, and 2020, the Company issued 57,795 and 267,576 shares, respectively, of its common stock to its non-employee directors under the Equity Plan. Shares issued during the second quarter of 2021 will fully vest on December 31, 2021. Shares issued during the second quarter of 2020 fully vested on December 31, 2020. Employee Stock Purchase Plan Under the Company’s Employee Stock Purchase Plan (“ESPP”), eligible employees may purchase shares of the Company’s common stock through payroll deductions of up to 15 percent of eligible compensation, subject to a maximum of 2,500 shares per offering period and a maximum of $25,000 in value related to purchases for each calendar year. The purchase price of the stock is 85 percent of the lower of the trading price of the stock on either the first or last day of the purchase period. The ESPP is intended to qualify as an “employee stock purchase plan” under Section 423 of the Internal Revenue Code. There were 252,665 and 297,013 shares issued under the ESPP during the nine months ended September 30, 2021, and 2020, respectively. Total proceeds to the Company for the issuance of these shares was $1.3 million and $0.9 million for the nine months ended September 30, 2021, and 2020, respectively. The fair value of ESPP grants is measured at the date of grant using the Black-Scholes option-pricing model. Please refer to Note 7 - Compensation Plans in the 2020 Form 10-K for additional detail on the Company’s Equity Plan.

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