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Costs Incurred for Property Acquisition, Exploration and Development (Tables) | 9 Months Ended
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Sep. 30, 2014
Extractive Industries [Abstract] |
Costs Incurred for Property Acquisition, Exploration and Development |
|  | Nine Months Ended September 30, 2014 |  |  | Year Ended December 31, 2013 |
|  | (in thousands) |
Acquisitions (b) |  | $ | 409,331 |  |  | $ | ¾ |
Acreage purchases |  |  | 143,850 |  |  |  | 137,538 |
Development |  |  | 775,570 |  |  |  | 938,668 |
Exploration: |  |  |  |  |  |  |  |
Drilling |  |  | 114,942 |  |  |  | 189,742 |
Expense |  |  | 36,502 |  |  |  | 60,384 |
Stock-based compensation expense |  |  | 3,408 |  |  |  | 4,025 |
Gas gathering facilities: |  |  |  |  |  |  |  |
Development |  |  | 12,986 |  |  |  | 47,086 |
Subtotal |  |  | 1,496,589 |  |  |  | 1,377,443 |
Asset retirement obligations |  |  | 7,815 |  |  |  | 76,373 |
Total costs incurred |  | $ | 1,504,404 |  |  | $ | 1,453,816 |
(a) Includes costs incurred whether capitalized or expensed. (b) See also Note 4 for additional information related to the Conger Exchange. Includes $134.8 million of gas gathering assets.

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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 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 Reference 2: 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 3: 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=8451039&loc=d3e62059-109447 Reference 4: 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=8451039&loc=d3e62038-109447 Reference 5: 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=8451039&loc=d3e62014-109447 + Details
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