Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
OPERATING ACTIVITIES
Net income	$ 53,456	$ 60,243
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	121,764	105,148
Other amortization	2,113	3,056
Share-based compensation	8,090	7,496
Amortization of straight-line rent receivable	(3,599)	(4,867)
Amortization of straight-line rent liability	1,147	492
Gain on sales of real estate assets	(30,879)	(39,525)
Impairment of real estate assets		5,387
Equity from unconsolidated joint ventures (income)	(15)
Distributions from unconsolidated joint ventures	182
Provision for bad debts, net	42	175
Changes in operating assets and liabilities:
Other assets	(6,891)	(6,037)
Accounts payable and accrued liabilities	5,908	(3,301)
Other liabilities	(638)	1,098
Net cash provided by operating activities	150,680	129,365
INVESTING ACTIVITIES
Acquisitions of real estate	(67,445)	(72,934)
Development of real estate	(21,059)	(11,753)
Additional long-lived assets	(59,802)	(52,305)
Proceeds from sales of real estate	64,271	119,425
Proceeds from notes receivable repayments	8	15
Net cash used in investing activities	(84,027)	(17,552)
FINANCING ACTIVITIES
Net borrowings (repayments) on unsecured credit facility	56,000	(107,000)
Repayments on notes and bonds payable	(3,808)	(4,654)
Dividends paid	(112,694)	(104,860)
Net proceeds from issuance of common stock	459	248,384
Common stock redemptions	(2,673)	(1,125)
Debt issuance and assumption costs	(125)	(84)
Net cash (used in) provided by financing activities	(62,841)	30,661
Increase in cash and cash equivalents	3,812	142,474
Cash and cash equivalents at beginning of period	6,215	54,507
Cash and cash equivalents at end of period	10,027	196,981
Supplemental Cash Flow Information:
Interest paid	30,463	42,136
Invoices accrued for construction, tenant improvements and other capitalized costs	5,680	6,842
Mortgage notes payable assumed upon acquisition (adjusted to fair value)	7,995	12,460
Capitalized interest	$ 684	$ 681