Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2013

Earnings Per Share

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

	Three Months Ended
	March 31,
	2013	2012
Weighted average number of common shares outstanding	90,421	90,306
Effect of non-participatory equity compensation	36	32
Weighted average number of common shares outstanding, including effect of dilutive securities	90,457	90,338