Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2013

Stockholders' Equity Note [Abstract]

Schedule of Stockholders Equity

The following table summarizes the changes in Common Stock and Treasury Stock:

	Treasury		Common Stock
Balance at December 31, 2010	119,906,910		203,431,002
Repurchases of common stock	4,692,200		(4,692,200	)
Issuance of common stock	(963,448	)	963,448
Conversions to common stock	(48,820	)	48,820
Balance at December 31, 2011	123,586,842		199,751,070
Issuance of common stock	(1,118,089	)	1,118,089
Conversions to common stock	(14,888	)	14,888
Balance at December 31, 2012	122,453,865		200,884,047
Issuance of common stock	(1,163,668	)	1,163,668
Conversions to common stock	(34,807	)	34,807
Balance at December 31, 2013	121,255,390		202,082,522