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Stock-Based Compensation | 3 Months Ended
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Mar. 31, 2017
Share-based Compensation [Abstract] |
Stock-Based Compensation | STOCK-BASED COMPENSATION During the three months ended March 31, 2017 and 2016, the Company’s stock-based compensation cost was $2.6 million and $3.3 million, respectively, of which the Company capitalized $1.0 million and $1.3 million, respectively, relating to its exploration and development efforts. The following table summarizes restricted stock activity for the three months ended March 31, 2017:
| Number of Unvested Restricted Shares |  | Weighted Average Grant Date Fair Value
Unvested shares as of January 1, 2017 | 613,056 |  |  | $ | 32.90 |
Granted | 477,768 |  |  | 17.74 |
Vested | (153,868 | ) |  | 31.98 |
Forfeited | (65,438 | ) |  | 31.23 |
Unvested shares as of March 31, 2017 | 871,518 |  |  | $ | 24.88 |
Unrecognized compensation expense as of March 31, 2017 related to restricted shares was $18.1 million. The expense is expected to be recognized over a weighted average period of 1.66 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 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=65895303&loc=d3e17540-113929 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68057994&loc=d3e25284-112666 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901 + Details
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