The following table reconciles the number of common shares used in calculating the basic and diluted earnings per share from continuing operations for the years ended December 31:



(Dollars in thousands, except per-share amounts)	2011	2010	2009
Earnings from continuing operations	$40,266	$40,275	$81,431

Basic average common shares outstanding	40,159,141	39,971,073	39,763,090
Incremental shares due to:
Common stock options	45,232	81,942	83,799
Performance shares	146,157	132,455	105,771
Restricted stock units	32,455	33,859	20,953
Diluted average common shares outstanding	40,382,985	40,219,329	39,973,613

Basic earnings per common share from continuing operations	$1.00	$1.01	$2.05
Diluted earnings per common share from continuing operations	$1.00	$1.00	$2.04

Anti-dilutive shares excluded from the calculation:
Performance shares	77,767	—	—
Restricted stock units	1,500	5,750	—
Total anti-dilutive shares excluded from the calculation	79,267	5,750	—

Options to purchase shares of common stock excluded from the computation of diluted earnings per share due to exercise prices greater than the average market price during the period	—	—	85,391