CONSOLIDATED STATEMENTS OF CASH FLOWS - Unaudited (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
OPERATING ACTIVITIES
Net Income	$ 35,617	$ 23,612
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization from continuing operations	52,101	48,784
Depreciation and amortization from discontinued operations	0	107
Stock-based compensation expense	4,005	3,204
Gain on sales of land and real estate investments	(7,610)	(24)
Changes in operating assets and liabilities:
Accrued income and other assets	2,197	2,222
Accounts payable, accrued expenses and prepaid rent	8,658	10,765
Other	(53)	(71)
NET CASH PROVIDED BY OPERATING ACTIVITIES	94,915	88,599
INVESTING ACTIVITIES
Real estate development	(80,748)	(61,561)
Purchases of real estate	(41,751)	(72,397)
Real estate improvements	(12,931)	(16,053)
Proceeds from sales of land and real estate investments	17,269	1,313
Repayments on mortgage loans receivable	118	78
Changes in accrued development costs	7,483	2,062
Changes in other assets and other liabilities	(15,529)	(9,431)
NET CASH USED IN INVESTING ACTIVITIES	(126,089)	(155,989)
FINANCING ACTIVITIES
Proceeds from unsecured bank credit facilities	251,033	307,725
Repayments on unsecured bank credit facilities	(255,465)	(272,218)
Repayments on secured debt	(43,268)	(51,920)
Proceeds from unsecured debt	75,000	100,000
Debt issuance costs	(434)	(1,650)
Distributions paid to stockholders (not including dividends accrued on unvested restricted stock)	(52,231)	(48,252)
Proceeds from common stock offerings	59,110	33,490
Proceeds from exercise of stock options	0	120
Proceeds from dividend reinvestment plan	154	156
Other	(2,410)	(1,112)
NET CASH PROVIDED BY FINANCING ACTIVITIES	31,489	66,339
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	315	(1,051)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	8	1,258
CASH AND CASH EQUIVALENTS AT END OF PERIOD	323	207
SUPPLEMENTAL CASH FLOW INFORMATION
Cash paid for interest, net of amount capitalized of $3,682 and $3,841 for 2014 and 2013, respectively	$ 26,788	$ 24,852