Shareholders' Equity (Tables)

12 Months Ended

Dec. 31, 2011

Shareholders' Equity [Abstract]

Summary Of Preferred And Common Share Activity

	Preferred Stock				Common Stock*
	Issued		Treasury Stock		Issued			Treasury Stock
2009:
Balance at January 1, 2009		0		0		128,812,123			(1,750,651	)
Grants of restricted stock									115,060
Issuance of common stock due to exercise of stock options									189,258
Treasury stock acquired									(3,104,700	)
Retirement of treasury stock						(3,000,000	)		3,000,000
Balance at December 31, 2009		0		0		125,812,123			(1,551,033	)
2010:
Grants of restricted stock									121,923
Forfeitures of restricted stock									(10,621	)
Issuance of common stock due to exercise of stock options									1,273,598
Treasury stock acquired									(6,781,364	)
Retirement of treasury stock						(6,000,000	)		6,000,000
Balance at December 31, 2010		0		0		119,812,123			(947,497	)
2011:
Grants of restricted stock									173,553
Forfeitures of restricted stock									(7,153	)
Issuance of common stock due to exercise of stock options									4,829,892
Treasury stock acquired									(23,281,453	)
Retirement of treasury stock						(7,500,000	)		7,500,000
Balance at December 31, 2011		0		0		112,312,123			(11,732,658	)

* Retroactively adjusted for stock split described in Note 1

Computation Of Basic And Diluted Earnings Per Share

	2011		2010		2009
Basic weighted average shares outstanding		108,278,113		122,009,228		124,550,384
Weighted average dilutive options outstanding		1,537,277		1,114,110		0
Diluted weighted average shares outstanding		109,815,390		123,123,338		124,550,384