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Stock-Based Compensation | 6 Months Ended
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Jun. 30, 2017
Share-based Compensation [Abstract] |
Stock-Based Compensation | STOCK-BASED COMPENSATION During the three and six months ended June 30, 2017, the Company’s stock-based compensation cost was $2.6 million and $5.2 million, respectively, of which the Company capitalized $1.1 million and $2.1 million, respectively, relating to its exploration and development efforts. During the three and six months ended June 30, 2016, the Company's stock-based compensation cost was $3.3 million and $6.6 million, respectively, of which the Company capitalized $1.3 million and $2.6 million, respectively, relating to its exploration and development efforts. The following table summarizes restricted stock activity for the six months ended June 30, 2017:
| Number of Unvested Restricted Shares |  | Weighted Average Grant Date Fair Value
Unvested shares as of January 1, 2017 | 613,056 |  |  | $ | 32.90 |
Granted | 525,808 |  |  | 17.31 |
Vested | (172,988 | ) |  | 32.06 |
Forfeited | (66,661 | ) |  | 31.18 |
Unvested shares as of June 30, 2017 | 899,215 |  |  | $ | 24.08 |
Unrecognized compensation expense as of June 30, 2017 related to restricted shares was $16.1 million. The expense is expected to be recognized over a weighted average period of 1.59 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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