Consolidated Statements of Changes In Shareholders' Equity (USD $) In Thousands, unless otherwise specified	Total		Class A Common Stock	Class B Common Stock	Common Stock Class A Common Stock	Common Stock Class B Common Stock	Surplus	Surplus Class B Common Stock	Retained Earnings	Retained Earnings Class A Common Stock	Retained Earnings Class B Common Stock	Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Loss Class B Common Stock
Balance at Dec. 31, 2010	$ 1,732,962				$ 8,757	$ 1,678	$ 143,766		$ 1,615,290			$ (36,529)
Comprehensive income:
Net income	164,481				0	0	0		164,481			0
Other comprehensive income, net of tax	4,002				0	0	0		0			4,002
Total comprehensive income	168,483
Repurchase of Class A and B common stock shares			(13,063)	(7,602)	(88)	(38)		0		(12,975)	(7,564)		0
Cash dividends	(9,364)				0	0	0		(9,364)			0
Balance at Sep. 30, 2011	1,871,416	[1]			8,669	1,640	143,766		1,749,868			(32,527)
Balance at Dec. 31, 2011	1,861,128	[2]			8,644	1,640	143,766		1,773,652			(66,574)
Comprehensive income:
Net income	112,602				0	0	0					0
Other comprehensive income, net of tax	14,588				0	0	0		0			14,588
Total comprehensive income	127,190
Repurchase of Class A and B common stock shares			(2,535)	(2,414)	(15)	(13)		0		(2,520)	(2,401)		0
Cash dividends	(9,245)				0	0	0		(9,245)			0
Balance at Sep. 30, 2012	$ 1,974,124	[1]			$ 8,629	$ 1,627	$ 143,766		$ 1,872,088			$ (51,986)

[1] Unaudited

[2] Derived from 2011 Annual Report on Form 10-K.