Capital Stock (Tables)

12 Months Ended

Dec. 31, 2012

Capital Stock (Tables)

Common Shares Outstanding and Treasury Shares Held Rollforward Table

Common Shares Outstanding	Year Ended December 31,
	2012		2011		2010
At beginning of period		77,423,415		76,291,745		75,542,282
Exercise of common stock options, net		580,097		858,727		354,219
Grants of restricted stock, net		108,520		272,943		395,244
At end of period		78,112,032		77,423,415		76,291,745

Treasury Shares Held	Year Ended December 31,
	2012		2011		2010
At beginning of period		2,249,959		1,533,653		1,497,346
Shares received upon exercise of common stock options		81,616		592,992		630
Shares received upon vesting of restricted stock, net		2,562		123,314		35,677
At end of period		2,334,137		2,249,959		1,533,653