Shareholders' Equity (Tables)

12 Months Ended

Dec. 31, 2013

Equity [Abstract]

Summary of Preferred and Common Share Activity

A summary of preferred and common share activity is as follows:

	Preferred Stock				Common Stock
	Issued		Treasury Stock		Issued			Treasury Stock
2011:
Balance at January 1, 2011		0		0		119,812,123			(947,497	)
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	)
2012:
Grants of restricted stock									69,720
Issuance of common stock due to exercise of stock options									5,357,490
Treasury stock acquired									(11,771,039	)
Retirement of treasury stock						(6,500,000	)		6,500,000
Balance at December 31, 2012		0		0		105,812,123			(11,576,487	)
2013:
Grants of restricted stock									50,943
Forfeitures and surrenders of restricted stock									(24,906	)
Issuance of common stock due to exercise of stock options									2,611,838
Issuance of common stock due to settlement of restricted stock units									7,460
Treasury stock acquired									(7,379,384	)
Retirement of treasury stock						(5,000,000	)		5,000,000
Balance at December 31, 2013		0		0		100,812,123			(11,310,536	)

Reconciliation of Basic and Diluted Weighted Average Shares Outstanding

A reconciliation of basic and diluted weighted-average shares outstanding used in the computation of basic and diluted earnings per share is as follows:

	2013		2012		2011
Basic weighted average shares outstanding		91,764,590		96,614,199		108,278,113
Weighted average dilutive options outstanding		1,277,933		1,284,189		1,537,277
Diluted weighted average shares outstanding		93,042,523		97,898,388		109,815,390