Common Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2011

Equity [Abstract]

Weighted Average Number of Common Shares Used In the Computation of Basic and Diluted Earnings per Share

The weighted average number of shares used in the computation of net income per share was as follows:

(Amounts in thousands)	2011	2010	2009
Basic	139,688	148,752	160,357
Diluted	145,672	155,081	166,574

Schedule of Changes in Shares of Common Stock Outstanding

Changes in shares of common stock outstanding, net of treasury shares, are presented below. Shares of common stock issued and outstanding do not include shares related to unissued restricted stock units and unexercised stock options.

(Amounts in thousands)	2011		2010		2009
Balance, beginning of year	141,010		156,552		161,467
Shares issued	2,702		2,272		1,467
Shares repurchased	(6,192	)	(17,814	)	(6,382	)
Balance, end of year	137,520		141,010		156,552