Earnings (Loss) Per Share (Tables)

12 Months Ended

Dec. 31, 2011

Earnings (Loss) Per Share [Abstract]

Computations Of Basic And Diluted Net Earnings Per Share

	2011			2010			2009
Basic net earnings (loss) per share:
Basic net earnings (loss)	$	778,188		$	134,092		$	(293,613	)
Earnings allocated to participating securities		(2,653	)		(1,823	)		(1,946	)
Net earnings (loss) available to common stockholders	$	775,535		$	132,269		$	(295,559	)
Average shares outstanding		316,997			315,962			314,873
Basic net earnings (loss) per share	$	2.45		$	0.42		($	0.94	)
Diluted net earnings (loss) per share:
Diluted net earnings (loss)	$	778,188		$	134,092		$	(293,613	)
Earnings allocated to participating securities		(2,654	)		(1,823	)		(1,946	)
Net earnings (loss) available to common stockholders	$	775,534		$	132,269		$	(295,559	)
Diluted average shares outstanding:
Basic shares outstanding		316,997			315,962			314,873
Dilutive effect of stock options and other		164			548			—
		317,161			316,510			314,873
Diluted net earnings (loss) per share	$	2.45		$	0.42		($	0.94	)