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Outstanding and Weighted Average Common Shares (Details) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Changes in Corporation's outstanding common shares
Balance at January 1	337,681	327,229	326,133
Issued for an acquisition	0	8,602	0
Activity related to restricted common stock awards, net	579	770	680
Employee stock options	1,716	1,080	416
Balance at December 31	339,976	337,681	327,229

Number of shares issued during the period related to Restricted Stock Awards, net of any shares forfeited.

Number of share options (or share units) exercised during the current period.