Capital Stock (Tables)

12 Months Ended

Dec. 31, 2011

Capital Stock (Tables)

Common Shares Outstanding and Treasury Shares Held Rollforward Table

Common Shares Outstanding	Year Ended December 31,
	2011		2010		2009
At beginning of period		76,291,745		75,542,282		75,258,959
Exercise of common stock options, net		858,727		354,219		204,651
Grants of restricted stock, net		272,943		395,244		78,672
At end of period		77,423,415		76,291,745		75,542,282

Treasury Shares Held	Year Ended December 31,
	2011		2010		2009
At beginning of period		1,533,653		1,497,346		1,582,465
Shares received upon exercise of common stock options		592,992		630		(106,000	)
Shares received upon vesting of restricted stock, net		123,314		35,677		20,881
At end of period		2,249,959		1,533,653		1,497,346