SUBSEQUENT EVENTS (Details) (USD $)	3 Months Ended			12 Months Ended	3 Months Ended	12 Months Ended	0 Months Ended	3 Months Ended	12 Months Ended	0 Months Ended		3 Months Ended		0 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014 Series A Cumulative Redeemable Preferred Stock	Dec. 31, 2013 Series A Cumulative Redeemable Preferred Stock	Mar. 31, 2014 Series B Cumulative Redeemable Preferred Stock	Dec. 31, 2013 Series B Cumulative Redeemable Preferred Stock	Mar. 20, 2013 Series C Cumulative Redeemable Preferred Stock	Mar. 31, 2014 Series C Cumulative Redeemable Preferred Stock	Dec. 31, 2013 Series C Cumulative Redeemable Preferred Stock	Jan. 02, 2014 Common stock	Jan. 03, 2013 Common stock	Mar. 31, 2014 Common stock	Mar. 31, 2013 Common stock	May 06, 2014 Subsequent Event Mortgage loan with Compass Bank due May 6, 2020	May 06, 2014 Subsequent Event Mortgage loan with Compass Bank due May 6, 2020 LIBOR	May 06, 2014 Subsequent Event Series A Cumulative Redeemable Preferred Stock	May 06, 2014 Subsequent Event Series B Cumulative Redeemable Preferred Stock	May 06, 2014 Subsequent Event Series C Cumulative Redeemable Preferred Stock	May 06, 2014 Subsequent Event Common stock	Apr. 02, 2014 Subsequent Event Common stock
Subsequent events
Shares of common stock issued to redeem common units										126,155	1,974,669	126,155	1,974,669							22,570
Cash dividends declared, common stock (in dollars per share)																			$ 0.1125
Cash dividends declared, preferred stock (in dollars per share)																$ 0.578125	$ 0.4921875	$ 0.4453125
Preferred stock, dividend rate (as a percent)			9.25%	9.25%	7.875%	7.875%	7.125%	7.125%	7.125%
Loan amount														$ 25,000,000
Debt obligation incurred	$ 90,998,000	$ 74,000,000
Variable rate basis															30-day LIBOR
Interest rate margin on variable rate basis (as a percent)															2.40%
Amortization period														20 years