Shareholders' Equity And Earnings Per Common Share (Tables)

12 Months Ended

Dec. 31, 2011

Shareholders' Equity And Earnings Per Common Share [Abstract]

Basic And Diluted Earnings Per Common Share

	2011		2010		2009
Distributed earnings allocated to common stock	$	111,827	$	107,597	$	101,718
Undistributed earnings allocated to common stock		104,980		100,340		76,594
Net earnings allocated to common stock	$	216,807	$	207,937	$	178,312
Weighted-average shares outstanding for basic earnings per common share		61,101,072		60,410,680		59,456,393
Dilutive effect of compensation		176,697		174,972		57,415
Weighted-average shares outstanding for diluted earnings per common share		61,277,769		60,585,652		59,513,808