Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2011

Earnings Per Share [Abstract]

Reconciliation of number of shares used in calculation of basic and diluted earnings per share

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2011		2010		2011		2010
Weighted average number of common shares outstanding		91,390		92,018		92,106		92,097
Effect of non-participatory equity compensation		41		123		63		74
Weighted average number of common shares outstanding, including effect of dilutive securities		91,431		92,141		92,169		92,171