Earnings per Common Share (Tables)

6 Months Ended

Jun. 30, 2011

Earnings Per Common Share

Basic and Diluted Earnings per Common Share

	Three Months Ended June 30,				Six Months Ended June 30,
	2011		2010		2011		2010
Distributed earnings allocated to common stock	$	28,102	$	27,181	$	55,572	$	52,997
Undistributed earnings allocated to common stock		27,378		25,512		51,630		47,320
Net earnings allocated to common stock	$	55,480	$	52,693	$	107,202	$	100,317
Weighted-average shares outstanding for basic earnings per common share		61,093,641		60,365,085		61,056,113		60,169,736
Dilutive effect of stock compensation		297,075		198,599		306,404		195,676
Weighted-average shares outstanding for diluted earnings per common share		61,390,716		60,563,684		61,362,517		60,365,412