Compensation Plans (Tables)

6 Months Ended

Jun. 30, 2013

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of stock option grants under prior stock option plans

A summary of activity associated with the Company’s Stock Option Plan for the six months ended June 30, 2013, is presented in the following table:

	Shares		Weighted- Average Exercise Price		Aggregate  Intrinsic Value (in thousands)
Outstanding, at beginning of year	267,846		$	14.95	$	9,983
Exercised	(121,318	)	$	13.85	$	5,638
Forfeited	—		$	—
Outstanding, at end of quarter	146,528		$	15.84	$	6,378
Vested and exercisable, at end of quarter	146,528		$	15.84	$	6,378

Summary of cash payments made or accrued under the Net Profits Plan

Cash payments made or accrued under the Company’s Net Profits Interest Bonus Plan (“Net Profits Plan”) that have been recorded as either G&A expense or exploration expense are presented in the table below:

	For the Three Months Ended June 30,				For the Six Months Ended June 30,
	2013		2012		2013		2012
	(in thousands)
General and administrative expense	$	3,443	$	3,682	$	7,229	$	8,094
Exploration expense	323		493		697		1,018
Total	$	3,766	$	4,175	$	7,926	$	9,112