CONDENSED CONSOLIDATED STATEMENT OF EQUITY (USD $) In Thousands, except Share data	Total	Common Stock Subject to Mandatory Redemption	Preferred Stock	7.00% Series A cumulative convertible perpetual preferred stock	8.125% Series B cumulative redeemable preferred stock	8.125% Series B cumulative redeemable preferred stock Preferred Stock	Common Stock	Common Stock Common Stock Subject to Mandatory Redemption	Additional Paid-in Capital	Additional Paid-in Capital Common Stock Subject to Mandatory Redemption	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Stockholders' Equity, Total	Stockholders' Equity, Total Common Stock Subject to Mandatory Redemption	Stockholders' Equity, Total Preferred Stock	Noncontrolling Interest	Noncontrolling Interest Common Stock Subject to Mandatory Redemption
Balance at Dec. 31, 2011	$ 380,986			$ 47,703			$ 302		$ 319,875		$ (3,277)	$ (811)	$ 363,792			$ 17,194
Balance (in shares) at Dec. 31, 2011							30,289,813
Net proceeds from sale of stock			88,710			88,710									88,710
Issuance of restricted common stock awards							5,000
Issuance of common stock for acquisition (in shares)							3,230,769
Redemption of OP units for common stock and cash (in shares)								115,919
Issuance of common stock for acquisition	39,108						32		39,076				39,108
Redemption of OP units for common stock and cash		(70)						1		1,369				1,370			(1,440)
Noncash amortization of share-based compensation	785								785				785
Common stock dividends	(5,467)								(5,467)				(5,467)
Distributions to non-controlling interests	(310)															(310)
Net income	433										438		438			(5)
Preferred stock dividends	(2,121)								(2,121)				(2,121)
Change in unrealized gain on investment in equity securities	21											20	20			1
Change in unrealized loss on interest rate swaps	(16)											(16)	(16)
Adjustment for non-controlling interests									(456)				(456)			456
Balance at Mar. 31, 2012	502,059			47,703	88,710		335		353,061		(2,839)	(807)	486,163			15,896
Balance (in shares) at Mar. 31, 2012							33,641,501
Balance at Dec. 31, 2012	608,772			47,703	88,720		448		459,151		(1,414)	(572)	594,036			14,736
Balance (in shares) at Dec. 31, 2012							44,905,683
Net proceeds from sale of stock (in shares)	2,063,828						2,063,828
Net proceeds from sale of stock	25,423						20		25,403				25,423
Issuance of restricted common stock awards							41,500
Redemption of OP units for common stock and cash (in shares)								22,074
Redemption of OP units for common stock and cash		44								279				279			(235)
Noncash amortization of share-based compensation	562								562				562
Common stock dividends	(7,996)								(7,996)				(7,996)
Distributions to non-controlling interests	(309)															(309)
Net income	324										296		296			28
Preferred stock dividends	(2,744)								(2,744)				(2,744)
Change in unrealized loss on interest rate swaps	161											157	157			4
Adjustment for non-controlling interests									(334)				(334)			334
Balance at Mar. 31, 2013	$ 624,237			$ 47,703	$ 88,720		$ 468		$ 474,321		$ (1,118)	$ (415)	$ 609,679			$ 14,558
Balance (in shares) at Mar. 31, 2013							47,033,085