Earnings Per Common Share (Tables)

3 Months Ended

Mar. 31, 2012

Earnings Per Common Share [Abstract]

Basic And Diluted Earnings Per Common Share

	Three Months Ended March 31,
	2012		2011
Distributed earnings allocated to common stock	$	28,152	$	27,470
Undistributed earnings allocated to common stock		32,691		24,252
Net earnings allocated to common stock	$	60,843	$	51,722
Weighted-average shares outstanding for basic earnings per common share		61,200,627		61,018,169
Dilutive effect of stock compensation		332,674		316,295
Weighted-average shares outstanding for diluted earnings per common share		61,533,301		61,334,464