SUBSEQUENT EVENTS (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	0 Months Ended		6 Months Ended		0 Months Ended		0 Months Ended
	May 01, 2013	Jan. 07, 2013	Jun. 30, 2013	Jun. 30, 2012	Jul. 29, 2013 Subsequent Event [Member] Meridian Pipeline Agreement [Member]	Jul. 29, 2013 Subsequent Event [Member] Meridian Pipeline Agreement [Member] Maximum [Member] Facilities	Jul. 31, 2013 Subsequent Event [Member] Dividend Declared [Member]
Subsequent Event [Line Items]
Common dividends, declared	$ 0.34	$ 0.34	$ 0.68	$ 0.66			$ 0.34
Preferred stock dividends, declared							$ 0.4453125
Number of Real Estate Properties						10
Purchase price					$ 100.0
Preferred rate of return					15.00%