Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
OPERATING ACTIVITIES
Net Income	$ 31,845	$ 9,156
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	35,803	31,211
Stock-based compensation	2,614	1,948
Amortization of straight-line rent receivable	(1,751)	(2,132)
Amortization of straight-line rent liability	156	184
Gain on sales of real estate assets	(23,408)
Impairment of real estate assets	323
Provision for bad debts, net	66	(39)
Changes in operating assets and liabilities:
Other assets	(1,662)	76
Accounts payable and accrued liabilities	(14,633)	(14,267)
Other liabilities	19	(2,550)
Net cash provided by operating activities	29,372	23,587
INVESTING ACTIVITIES
Acquisitions of real estate	(14,143)	(37,953)
Development of real estate	(2,804)	(7,995)
Additional long-lived assets	(18,997)	(10,835)
Proceeds from sales of real estate	79,747
Proceeds from mortgages and notes receivable repayments	3	5
Net cash provided by (used in) investing activities	43,806	(56,778)
FINANCING ACTIVITIES
Net borrowings (repayments) on unsecured credit facility	15,000	(7,000)
Borrowings of mortgage notes and bonds payable		11,500
Repayments on notes and bonds payable	(1,032)	(11,317)
Dividends paid	(34,937)	(30,727)
Net proceeds from issuance of common stock	791	70,181
Common stock redemptions	(1,125)	(1,264)
Debt issuance and assumption costs		(110)
Net cash provided by (used in) financing activities	(21,303)	31,263
Increase (decrease) in cash, cash equivalents and restricted cash	51,875	(1,928)
Cash, cash equivalents and restricted cash at beginning of period	54,507	4,102
Cash, cash equivalents and restricted cash at beginning of period	106,382	2,174
Supplemental Cash Flow Information:
Interest paid	14,536	15,151
Invoices accrued for construction, tenant improvements and other capitalized costs	11,394	16,177
Capitalized interest	$ 237	$ 179