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STOCK-BASED COMPENSATION | 9 Months Ended
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Sep. 30, 2018
Share-based Compensation [Abstract] |
STOCK-BASED COMPENSATION | STOCK-BASED COMPENSATION During the three and nine months ended September 30, 2018, the Company’s stock-based compensation cost was $3.6 million and $9.7 million, respectively, of which the Company capitalized $1.4 million and $3.9 million, respectively, relating to its exploration and development efforts. During the three and nine months ended September 30, 2017, the Company’s stock-based compensation cost was $2.8 million and $8.0 million, respectively, of which the Company capitalized $1.1 million and $3.2 million, respectively, relating to its exploration and development efforts. The following table summarizes restricted stock activity for the nine months ended September 30, 2018:
| Number of Unvested Restricted Shares |  | Weighted Average Grant Date Fair Value
Unvested shares as of January 1, 2018 | 976,027 |  |  | $ | 18.71 |
Granted | 1,197,628 |  |  | 9.45 |
Vested | (618,202 | ) |  | 17.77 |
Forfeited | (32,633 | ) |  | 17.31 |
Unvested shares as of September 30, 2018 | 1,522,820 |  |  | $ | 11.84 |
Unrecognized compensation expense as of September 30, 2018 related to restricted shares was $15.5 million. The expense is expected to be recognized over a weighted average period of 1.63 years.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + 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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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