Earnings Per Share

12 Months Ended

Dec. 31, 2011

Earnings per share of common stock [Abstract]

Earnings Per Share Text Block

3.Earnings Per Share

Basic earnings per share are computed using net income and the weighted average number of common shares outstanding for each period presented.  Diluted earnings per share are computed in the same manner, except it uses the weighted average number of common shares outstanding plus the effects of the assumed exercise of stock options and the payment of estimated stock awards from other stock-based compensation plans that are outstanding at the end of each period presented.  Diluted earnings per share are calculated as follows:

Thousands, except per share amounts			2011		2010		2009
Net income		$	63,898	$	72,667	$	75,122
Average common shares outstanding - basic			26,687		26,589		26,511
	Additional shares for stock-based compensation plans		57		68		65
Average common shares outstanding - diluted			26,744		26,657		26,576
Earnings per share of common stock - basic		$	2.39	$	2.73	$	2.83
Earnings per share of common stock - diluted		$	2.39	$	2.73	$	2.83
Additional information:
	Antidilutive shares not included in net income per diluted
	common share calculation		2,101		743		2,142