Income Taxes (Tables)

6 Months Ended

Jun. 30, 2012

Income Tax Disclosure [Abstract]

Schedule Of Effective Income Tax Rate Reconciliation

Income tax expense differs from income tax expense computed by applying the U.S. federal statutory corporate income tax rate of 35% to income before income taxes as follows:

	Three Months Ended June 30,						Six Months Ended June 30,
	2012			2011			2012			2011
	(In thousands)
Income tax expense at the statutory rate	$	15,160		$	3,971		$	19,864		$	4,599
State income taxes, net of U.S. federal income tax benefit	865			127			1,087			1,702
U.K. income tax benefit	(1,320		)	(175		)	(2,536		)	(175		)
Capital loss associated with investment in Pinnacle Gas Resources, Inc. for which no income tax benefit was recognized in prior periods	—			—			—			(1,135		)
Other, net	105			(321		)	413			(329		)
Income tax expense	$	14,810		$	3,602		$	18,828		$	4,662