CONSOLIDATED STATEMENTS OF CASH FLOWS - Unaudited (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
OPERATING ACTIVITIES
Net Income	$ 15,098	$ 13,605
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization from continuing operations	31,943	31,175
Depreciation and amortization from discontinued operations	0	382
Stock-based compensation expense	2,327	2,033
Gain on sales of land and real estate investments	0	(2,036)
Changes in operating assets and liabilities:
Accrued income and other assets	2,745	1,573
Accounts payable, accrued expenses and prepaid rent	743	(5,020)
Other	(62)	(151)
NET CASH PROVIDED BY OPERATING ACTIVITIES	52,794	41,561
INVESTING ACTIVITIES
Real estate development	(40,165)	(24,695)
Purchases of real estate	(69,952)	(3,475)
Real estate improvements	(9,501)	(9,398)
Proceeds from sales of real estate investments	0	7,399
Repayments on mortgage loans receivable	52	3
Changes in receivable for development infrastructure cost reimbursements	(1,351)	0
Changes in accrued development costs	2,970	(2,699)
Changes in other assets and other liabilities	(4,426)	(4,770)
NET CASH USED IN INVESTING ACTIVITIES	(122,373)	(37,635)
FINANCING ACTIVITIES
Proceeds from bank borrowings	194,775	143,560
Repayments on bank borrowings	(94,002)	(177,131)
Proceeds from mortgage notes payable	0	54,000
Principal payments on mortgage notes payable	(12,296)	(58,201)
Debt issuance costs	(1,459)	(821)
Distributions paid to stockholders (not including dividends accrued on unvested restricted stock)	(31,874)	(29,717)
Proceeds from common stock offerings	13,877	64,202
Proceeds from exercise of stock options	120	108
Proceeds from dividend reinvestment plan	105	118
Other	(915)	(100)
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES	68,331	(3,982)
DECREASE IN CASH AND CASH EQUIVALENTS	(1,248)	(56)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	1,258	174
CASH AND CASH EQUIVALENTS AT END OF PERIOD	10	118
SUPPLEMENTAL CASH FLOW INFORMATION
Cash paid for interest, net of amount capitalized of $2,560 and $2,129 for 2013 and 2012, respectively	$ 16,657	$ 17,938