Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2011

Earnings Per Share

Computation of Basic and Diluted Earnings Per Share

	Three Months EndedSeptember 30,				Nine Months Ended September 30,
	2011		2010		2011		2010
Net income/(loss)	$	22,304	$	(84,336)	$	57,118	$	(39,487)
Shares for basic and diluted calculations:
Average shares used in basic computation		52,367		51,201		52,610		47,865
Dilutive effect of stock options and units (1)		10,785		10,633		10,564		7,728
Average shares used in diluted computation	$	63,152	$	61,834	$	63,174	$	55,593
Net income per share:
Basic	$	0.43	$	(1.65)	$	1.09	$	(0.82)
Diluted (1) (2)	$	0.35	$	(1.65)	$	0.90	$	(0.82)

 (1)      Diluted earnings per share is computed on the basis of the weighted average number of shares of common stock plus the effect of dilutive potential common shares outstanding during the period using the treasury stock method. Diluted earnings per share include stock options and units.

        In accordance with Topic 260, "Earnings Per Share," earnings per diluted common share is calculated using the basic weighted average number of common shares outstanding in p

	Three Months EndedSeptember 30,					Nine Months Ended September 30,
		2011		2010			2011		2010
Net income/(loss)		$	22,304	$	(84,336)		$	57,118	$	(39,487)
Shares for basic and diluted calculations:
Average shares used in basic computation			52,367		51,201			52,610		47,865
Dilutive effect of stock options and units (1)			10,785		10,633			10,564		7,728
Average shares used in diluted computation		$	63,152	$	61,834		$	63,174	$	55,593
Net income per share:
Basic		$	0.43	$	(1.65)		$	1.09	$	(0.82)
Diluted (1) (2)		$	0.35	$	(1.65)		$	0.90	$	(0.82)

eriods a loss is incurred.