Disclosure of Changes in Number of Shares	3 Months Ended		12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Treasury stock - at cost, shares	(438,868)	(212,374)	(441,829)
Common Stock - Outstanding	1,027,117,068	1,023,416,118	1,025,904,567
Common Stock Member
Beginning balance	1,026,346,396	1,022,929,158	1,022,929,158
Issuance of stock	1,209,540	699,334	3,417,238
Ending balance	1,027,555,936	1,023,628,492	1,026,346,396
Preferred Stock Member
Ending balance	2,006,391	2,006,391	2,006,391