SUBSEQUENT EVENTS (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
$100 Million Private Placement Unsecured Debt To Be Obtained [Member]
Subsequent Event [Line Items]
Anticipated Proceeds from Issuance of Unsecured Notes	$ 100
Unsecured Note Instrument, Interest Rate Terms	3.80%
Principal Payment Due August 30, 2020	30
Principal Payment Due August 30, 2023	50
Principal Payment Due August 30, 2025	20
Steele Creek Commerce Park land acquisition [Member]
Subsequent Event [Line Items]
Acres of land	42.4
Purchase Price of Land	5.7
Plans for future development (square feet)	465,000
Plans for Future Development Number of Buildings	6
Steele Creek Commerce Park Construction Starts Planned for Second Quarter 2013 [Member] [Member]
Subsequent Event [Line Items]
Anticipated construction starts	2
Plans for future development per building (square feet)	70,000
Projected total cost for development starts	$ 9.5
Percent Leased for one development project to be started in second quarter 2013	100.00%