Unaudited Quarterly Information

12 Months Ended

Dec. 31, 2012

Quarterly Financial Data [Abstract]

Unaudited Quarterly Information

Note 16. Unaudited Quarterly Information

In thousands, except per share amounts	March 31			June 30			September 30			December 31
2012
Revenues and other income	$	645,116		$	601,781		$	600,371		$	609,204
Derivatives expense (income)	45,275			(139,109		)	61,631			27,369
Other expenses	420,529			398,089			399,361			386,470
Net income	113,467			211,865			85,367			114,661
Net income per share:
Basic	0.29			0.55			0.22			0.30
Diluted	0.29			0.54			0.22			0.30
Cash flow provided by operating activities	291,654			440,966			293,506			384,765
Cash flow used for investing activities	(288,883		)	(560,341		)	(388,748		)	(138,869		)
Cash flow provided by (used for) financing activities	55,902			70,122			91,163			(118,676		)
2011
Revenues and other income	$	514,165		$	601,397		$	576,505		$	617,257
Derivatives expense (income)	170,750			(172,904		)	(210,154		)	159,811
Other expenses	366,361			350,499			343,339			377,577
Net income (loss)	(14,190		)	259,246			275,670			52,607
Net income (loss) per share:
Basic	(0.04		)	0.65			0.69			0.14
Diluted	(0.04		)	0.64			0.68			0.13
Cash flow provided by operating activities	124,832			398,521			315,739			365,722
Cash flow used for investing activities	(285,043		)	(347,797		)	(525,412		)	(447,706		)
Cash flow provided by (used for) financing activities	(93,801		)	(56,789		)	112,244			76,314