COMMON EQUITY COMMON EQUITY (Details 1) (USD $)	Jun. 30, 2013	Dec. 31, 2012
Reconciliation of shares outstanding
Common stock, shares issued	79,456,539	78,287,906
Deferred compensation rabbi trust (in shares)	462,381	385,439
Total common shares outstanding	78,994,158	77,902,467
Average cost of shares in the rabbi trust (in dollars per share)	$ 48.33	$ 46.03