Costs of Oil and Gas Properties (Tables)

9 Months Ended

Sep. 30, 2014

Oil and Gas Property, Successful Effort Method, Gross [Abstract]

Schedule of net capitalized costs for oil and gas properties

The following table sets forth the net capitalized costs for oil and gas properties as of September 30, 2014 and December 31, 2013.

	September 30, 2014			December 31, 2013
	(In thousands)
Proved properties	$	2,479,681		$	2,317,053
Unproved properties	97,220			86,224
Total capitalized costs	2,576,901			2,403,277
Accumulated depletion	(1,382,667		)	(1,282,989		)
Net capitalized costs	$	1,194,234		$	1,120,288