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Costs Incurred for Property Acquisition, Exploration and Development (Tables) | 3 Months Ended
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Mar. 31, 2016
Extractive Industries [Abstract] |
Costs Incurred for Property Acquisition, Exploration and Development |
|  | Three Months Ended March 31, 2016 |  |  | Year Ended December 31, 2015 |
|  | (in thousands) |
Acreage purchases |  | $ | 5,341 |  |  | $ | 73,025 |
Development |  |  | 120,903 |  |  |  | 708,268 |
Exploration: |  |  |  |  |  |  |  |
Drilling |  |  | 9,097 |  |  |  | 87,505 |
Expense |  |  | 4,223 |  |  |  | 18,421 |
Stock-based compensation expense |  |  | 690 |  |  |  | 2,985 |
Gas gathering facilities: |  |  |  |  |  |  |  |
Development |  |  | 848 |  |  |  | 13,337 |
Subtotal |  |  | 141,102 |  |  |  | 903,541 |
Asset retirement obligations |  |  | 1,015 |  |  |  | 22,184 |
Total costs incurred |  | $ | 142,117 |  |  | $ | 925,725 |
(a) | Includes costs incurred whether capitalized or expensed.

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- Definition Tabular disclosure of the aggregate of costs (whether the costs are capitalized or charged to expense at the time they are incurred ) incurred for the year in oil and gas property acquisition, exploration and development activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 55 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=34713648&loc=d3e63042-109448 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e62059-109447 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e62038-109447 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e62014-109447 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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