CONSOLIDATED STATEMENTS OF CASH FLOWS - Unaudited - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
OPERATING ACTIVITIES
Net Income	$ 65,922	$ 80,723
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	62,101	57,756
Stock-based compensation expense	4,266	3,959
Gain, net of loss, on sales of real estate investments and non-operating real estate	(21,815)	(43,046)
Changes in operating assets and liabilities:
Accrued income and other assets	881	2,061
Accounts payable, accrued expenses and prepaid rent	10,586	5,221
Other	765	278
NET CASH PROVIDED BY OPERATING ACTIVITIES	122,706	106,952
INVESTING ACTIVITIES
Real estate development	(80,462)	(94,781)
Purchases of real estate	(36,739)	(24,955)
Real estate improvements	(18,378)	(17,591)
Net proceeds from sales of real estate investments and non-operating real estate	39,934	77,298
Repayments on mortgage loans receivable	96	91
Changes in accrued development costs	2,032	7,469
Changes in other assets and other liabilities	(11,240)	(11,588)
NET CASH USED IN INVESTING ACTIVITIES	(104,757)	(64,057)
FINANCING ACTIVITIES
Proceeds from unsecured bank credit facilities	281,342	444,314
Repayments on unsecured bank credit facilities	(255,988)	(388,569)
Proceeds from Unsecured Debt	0	105,000
Repayments of Unsecured Debt	0	(80,000)
Repayments on secured debt	(55,478)	(89,295)
Debt issuance costs	(129)	(1,165)
Distributions paid to stockholders (not including dividends accrued on unvested restricted stock)	(64,623)	(60,418)
Proceeds from common stock offerings	78,956	29,643
Proceeds from dividend reinvestment plan	170	179
Other	(2,711)	(2,599)
NET CASH USED IN FINANCING ACTIVITIES	(18,461)	(42,910)
DECREASE IN CASH AND CASH EQUIVALENTS	(512)	(15)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	522	48
CASH AND CASH EQUIVALENTS AT END OF PERIOD	10	33
SUPPLEMENTAL CASH FLOW INFORMATION
Cash paid for interest, net of amount capitalized of $4,242 and $3,737 for 2017 and 2016, respectively	$ 24,978	$ 25,977