Costs Incurred for Property Acquisition, Exploration and Development (Tables)

3 Months Ended

Mar. 31, 2013

Costs Incurred for Property Acquisition, Exploration and Development

	Three Months Ended March 31, 2013	Year Ended December 31, 2012

	(in thousands)

Acreage purchases	$ 9,394	$ 188,843
Development	309,240	1,049,129
Exploration:
Drilling	70,853	309,816
Expense	15,710	65,758
Stock-based compensation expense	1,070	4,049
Gas gathering facilities:
Development	6,789	41,035

Subtotal	413,056	1,658,630
Asset retirement obligations	1,690	57,982

Total costs incurred	$ 414,746	$ 1,716,612

(a) Includes cost incurred whether capitalized or expensed.

- 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.

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