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Costs Incurred for Property Acquisition, Exploration and Development | 6 Months Ended
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Jun. 30, 2013
Costs Incurred for Property Acquisition, Exploration and Development | (17) Costs Incurred for Property Acquisition, Exploration and Development (a)
| 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 Cost incurred for property acquisition exploration and development activities. + References No definition available. + Details
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Period Type: | duration