Unaudited Quarterly Information

12 Months Ended

Dec. 31, 2011

Unaudited Quarterly Information [Abstract]

Unaudited Quarterly Information

Note 17. Unaudited Quarterly Information

In thousands, except per share amounts		March 31		June 30		September 30		December 31
2011
Revenues and other income		$	514,165	$	601,397	$	576,505	$	617,257
Expenses			537,111		177,595		133,185		537,388
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 from 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
2010
Revenues and other income		$	438,821	$	497,210	$	466,703	$	519,057
Expenses			261,676		265,518		415,170		500,357
Net income			96,888		135,367		29,104		10,364
Net income per share:
	Basic		0.33		0.34		0.07		0.03
	Diluted		0.32		0.34		0.07		0.03
Cash flow from operating activities			113,168		271,123		208,484		263,036
Cash flow provided by (used for) investing activities			(764,327)		505,713		(261,539)		165,373
Cash flow provided by (used for) financing activities			739,753		(818,547)		71,926		(132,885)