Weighted Average Shares Outstanding (Tables)

12 Months Ended

Dec. 31, 2012

Weighted Average Shares Outstanding [Abstract]

Schedule of Weighted Average Number of Shares

A reconciliation of the weighted-average number of common shares outstanding used in the calculation of basic and diluted earnings per share follows:

	Weighted-Average Common Shares Outstanding
	2012	2011	2010
Basic	54,626,453	55,214,586	55,259,732
Dilutive effect of:
Stock options	478,462	645,280	591,943
Restricted stock units	70,554	19,089	4,608
Non-Employee Director Deferred Stock Plan	48,988	52,927	68,904
Diluted	55,224,457	55,931,882	55,925,187