Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
OPERATING ACTIVITIES
Net income	$ 9,180	$ 31,845
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	39,573	34,452
Other amortization	584	1,351
Share-based compensation	2,822	2,614
Amortization of straight-line rent receivable	(1,722)	(1,751)
Amortization of straight-line rent liability	384	156
Gain on sales of real estate assets		(23,408)
Impairment of real estate assets		323
Equity in losses from unconsolidated joint ventures	10	0
Distributions from unconsolidated joint ventures	37
Provision for bad debts, net		66
Changes in operating assets and liabilities:
Other assets	(4,193)	(1,662)
Accounts payable and accrued liabilities	(6,949)	(14,633)
Other liabilities	1,094	19
Net cash provided by operating activities	40,820	29,372
INVESTING ACTIVITIES
Acquisitions of real estate	(1,756)	(14,143)
Development of real estate	(7,573)	(2,804)
Additional long-lived assets	(16,764)	(18,997)
Proceeds from sales of real estate		79,747
Proceeds from notes receivable repayments	5	3
Net cash provided by (used in) investing activities	(26,088)	43,806
FINANCING ACTIVITIES
Net borrowings on unsecured credit facility	24,000	15,000
Repayments on notes and bonds payable	(1,154)	(1,032)
Dividends paid	(37,556)	(34,937)
Net proceeds from issuance of common stock	236	791
Common stock redemptions	(2,633)	(1,125)
Debt issuance and assumption costs	(44)
Net cash used in financing activities	(17,151)	(21,303)
Increase (decrease) in cash, cash equivalents and restricted cash	(2,419)	51,875
Cash, cash equivalents and restricted cash at beginning of period	6,215	54,507
Cash, cash equivalents and restricted cash at beginning of period	3,796	106,382
Supplemental Cash Flow Information:
Interest paid	3,899	14,536
Invoices accrued for construction, tenant improvements and other capitalized costs	8,592	11,394
Capitalized interest	$ 186	$ 237