CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
OPERATING ACTIVITIES
Net income	$ 22,834	$ 18,755	$ 27,094
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization from continuing operations	57,451	58,350	53,953
Depreciation and amortization from discontinued operations	0	0	51
Stock-based compensation expense	2,452	1,998	1,827
Changes in operating assets and liabilities:
Accrued income and other assets	(1,425)	212	1,258
Accounts payable, accrued expenses and prepaid rent	5,466	(2,268)	(3,345)
Other	(231)	(189)	(254)
NET CASH PROVIDED BY OPERATING ACTIVITIES	86,547	76,858	80,584
INVESTING ACTIVITIES
Real estate development	(42,148)	(9,145)	(35,057)
Purchases of real estate	(88,592)	(23,906)	(17,725)
Real estate improvements	(19,048)	(23,720)	(14,474)
Proceeds from sales of land and real estate investments	0	0	908
Repayments on mortgage loans receivable	33	37	31
Changes in accrued development costs	5,255	8	(6,462)
Changes in other assets and other liabilities	(6,333)	(6,775)	(7,545)
NET CASH USED IN INVESTING ACTIVITIES	(150,833)	(63,501)	(80,324)
FINANCING ACTIVITIES
Proceeds from bank borrowings	336,575	211,041	225,314
Repayments on bank borrowings	(273,353)	(208,903)	(246,044)
Proceeds from mortgage notes payable	65,000	74,000	76,365
Principal payments on mortgage notes payable	(81,128)	(32,401)	(59,100)
Proceeds from unsecured term loan payable	50,000	0	0
Debt issuance costs	(925)	(709)	(492)
Distributions paid to stockholders	(56,042)	(56,294)	(54,316)
Proceeds from common stock offerings	25,181	303	57,181
Proceeds from exercise of stock options	217	404	1,180
Proceeds from dividend reinvestment plan	249	262	268
Other	(1,451)	(1,985)	153
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES	64,323	(14,282)	509
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	37	(925)	769
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	137	1,062	293
CASH AND CASH EQUIVALENTS AT END OF YEAR	174	137	1,062
SUPPLEMENTAL CASH FLOW INFORMATION
Cash paid for interest, net of amount capitalized of $3,771, $3,613 and $5,856 for 2011, 2010 and 2009, respectively	33,671	34,380	31,297
Fair value of common stock awards issued to employees and directors, net of forfeitures	$ 3,868	$ 5,174	$ 2,444