Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
OPERATING ACTIVITIES
Net income	$ 9,156	$ 5,382
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	31,211	30,214
Stock-based compensation	1,948	1,617
Straight-line rent receivable	(2,132)	(2,858)
Straight-line rent liability	184	195
Impairments of real estate properties	0	3,328
Provision for bad debts, net	(39)	(208)
Changes in operating assets and liabilities:
Other assets	76	(2,914)
Accounts payable and accrued liabilities	(14,267)	(18,989)
Other liabilities	(2,550)	1,337
Net cash provided by operating activities	23,587	17,104
INVESTING ACTIVITIES
Acquisitions of real estate	(37,953)	(37,139)
Development of real estate	(7,995)	(4,320)
Additional long-lived assets	(10,835)	(11,161)
Proceeds from mortgages and notes receivable repayments	5	5
Net cash used in investing activities	(56,778)	(52,615)
FINANCING ACTIVITIES
Net borrowings (repayments) on unsecured credit facility	(7,000)	57,000
Borrowings on notes and bonds payable	11,500
Repayments on notes and bonds payable	(11,317)	(16,468)
Dividends paid	(30,727)	(29,832)
Net proceeds from issuance of common stock	70,181	31,910
Common stock redemptions	(1,264)	(201)
Debt issuance and assumption costs	(110)
Net cash provided by financing activities	31,263	42,409
Increase (decrease) in cash and cash equivalents	(1,928)	6,898
Cash and cash equivalents, beginning of period	4,102	3,519
Cash and cash equivalents, end of period	2,174	10,417
Supplemental Cash Flow Information:
Interest paid	15,151	25,313
Invoices accrued for construction, tenant improvement and other capitalized costs	16,177	$ 4,247
Capitalized interest	$ 179