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Stock-Based Compensation | 3 Months Ended
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Mar. 31, 2018
Share-based Compensation [Abstract] |
Stock-Based Compensation | STOCK-BASED COMPENSATION During the three months ended March 31, 2018 and 2017, the Company’s stock-based compensation cost was $2.7 million and $2.6 million, respectively, of which the Company capitalized $1.1 million and $1.0 million, respectively, relating to its exploration and development efforts. The following table summarizes restricted stock activity for the three months ended March 31, 2018:
| Number of Unvested Restricted Shares |  | Weighted Average Grant Date Fair Value
Unvested shares as of January 1, 2018 | 976,027 |  |  | $ | 18.71 |
Granted | 140,041 |  |  | 8.77 |
Vested | (109,933 | ) |  | 21.42 |
Forfeited | (5,937 | ) |  | 17.34 |
Unvested shares as of March 31, 2018 | 1,000,198 |  |  | $ | 17.03 |
Unrecognized compensation expense as of March 31, 2018 related to restricted shares was $12.9 million. The expense is expected to be recognized over a weighted average period of 1.53 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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