Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 219,959	$ 80,104	$ 125,629
Adjustments to reconcile net income to net cash provided by operating activities:
Gain on sale of investment properties	(133,059)	(77,114)	(79,843)
(Gain) loss on extinguishment of debt	(2,258)	5,180	0
Depreciation and amortization, including discontinued operations	196,745	145,293	135,462
Amortization of deferred financing costs and premium/discount on notes payable	(2,139)	(1,595)	1,423
Stock-based compensation expense, net of forfeitures	2,994	2,152	1,473
Effect of non-cash adjustments to rental revenues	(40,410)	(25,873)	(26,475)
Income from unconsolidated joint ventures	(47,115)	(10,562)	(8,302)
Operating distributions from unconsolidated joint ventures	11,065	14,184	11,664
Other	0	4,526	(263)
Changes in other operating assets and liabilities:
Change in other receivables and other assets, net	11,456	2,156	(10,937)
Change in operating liabilities	(5,589)	(20,749)	4,471
Net cash provided by operating activities	211,649	117,702	154,302
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from investment property sales	370,944	622,643	225,307
Proceeds from sale of interest in unconsolidated joint venture	12,514	0	0
Property acquisition, development, and tenant asset expenditures	(319,975)	(193,534)	(184,988)
Investment in unconsolidated joint ventures	(20,080)	(28,531)	(9,985)
Purchase of tenant-in-common interest	(13,382)	0	0
Distributions from unconsolidated joint ventures	75,506	949	4,651
Cash and restricted cash acquired in merger with Parkway Properties, Inc.	0	93,753	0
Investments in marketable securities	0	(21,190)	0
Change in notes receivable and other assets	6,583	(8,241)	118
Net cash provided by investing activities	112,110	465,849	35,103
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from credit facility	589,300	716,800	355,900
Repayment of credit facility	(723,300)	(674,800)	(404,100)
Proceeds from notes payable	350,000	870,000	0
Repayment of notes payable	(495,913)	(907,300)	(22,851)
Cash distributed to Parkway, Inc.	0	(192,755)	0
Payment of deferred financing costs	(2,074)	0	0
Common stock issued, net of expenses	211,521	0	8
Repurchase of common stock	0	(13,743)	(47,790)
Common dividends paid	(99,151)	(50,548)	(69,196)
Contributions from noncontrolling interests	2,646	4,126	0
Distributions to nonredeemable noncontrolling interests	(1,807)	(286,122)	(111)
Other	(557)	(4,195)	0
Net cash used in financing activities	(169,335)	(538,537)	(188,140)
NET INCREASE IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH	154,424	45,014	1,265
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH AT BEGINNING OF PERIOD	51,321	6,307	5,042
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH AT END OF PERIOD	$ 205,745	$ 51,321	$ 6,307