COMMON EQUITY - RECONCILIATION OF SHARES ISSUED AND OUTSTANDING (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
Reconciliation of Shares Issued and Outstanding
Common stock issued (in shares)	79,963,091	79,919,176
Deferred compensation rabbi trust (in shares)	428,720	473,796
Total common shares outstanding	79,534,371	79,445,380
Average cost of shares in the rabbi trust (in dollars per share)	$ 48.60	$ 48.50