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Costs Incurred for Property Acquisition, Exploration and Development (Tables) | 6 Months Ended
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Jun. 30, 2013
Costs Incurred for Property Acquisition, Exploration and Development |
| Six Months Ended June 30, 2013 |  |  | Year Ended December 31, 2012 |
--- | --- | --- | --- | --- | ---
| (in thousands) |
Acreage purchases | $ |  | 31,049 |  |  | $ |  | 188,843 |
Development |  | 500,534 |  |  |  | 1,049,129 |
Exploration: |  |  |  |  |  |  |
Drilling |  | 141,838 |  |  |  | 309,816 |
Expense |  | 27,818 |  |  |  | 65,758 |
Stock-based compensation expense |  | 2,030 |  |  |  | 4,049 |
Gas gathering facilities: |  |  |  |  |  |  |
Development |  | 21,081 |  |  |  | 41,035 |
Subtotal |  | 724,350 |  |  |  | 1,658,630 |
Asset retirement obligations |  | (2,385 | ) |  |  | 57,982 |
Total costs incurred | $ |  | 721,965 |  |  | $ |  | 1,716,612 |
(a) Includes cost 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 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=8451751&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 18 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62014-109447 Reference 5: 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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 19 -Paragraph 59P, 59Q, 59R -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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