CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating activities
Net income (loss)	$ 94,723	$ 44,208	$ (12,037)
Adjustments to reconcile net income (loss) to cash provided by operating activities:
Depreciation and amortization	190,387	182,955	118,031
Depreciation and amortization-discontinued operations	0	116	4,560
Net amortization of above (below) market leases	(16,288)	(13,690)	2,210
Net amortization of above market leases-discontinued operations	0	0	33
Amortization of financing costs	3,112	2,845	2,448
Amortization of financing costs-discontinued operations	0	0	17
Amortization of debt premium, net	(12,025)	(6,374)	0
Non-cash adjustment for interest rate swaps	136	(19)	0
Share-based compensation expense	6,230	7,417	5,730
Deferred income tax expense (benefit)	363	(4,763)	(1,960)
Gain on sale of in-substance real estate	0	(6,289)	0
Net gains on sale of real estate	(110,732)	(76,378)	0
Net gains on sale of real estate-discontinued operations	0	(10,463)	(32,493)
Gain on sale of unconsolidated property	(9,698)	0	0
Non-cash impairment loss on real estate	5,400	11,700	0
Non-cash impairment loss on real estate-discontinued operations	0	0	10,200
Non-cash impairment loss on management contracts, net of tax	0	4,750	0
Loss on extinguishment of debt	6,062	0	0
Equity in (earnings) losses of unconsolidated joint ventures	(2,204)	967	(178)
Distributions of income from unconsolidated joint ventures	4,490	5,338	0
Increase in deferred leasing costs	(22,589)	(16,742)	(16,117)
Changes in operating assets and liabilities:
Change in condominium units	9,318	10,582	0
Change in receivables and other assets	(54,976)	(65,846)	(25,739)
Change in accounts payable and other liabilities	(9,061)	(17,310)	10,381
Cash provided by operating activities	82,648	53,004	65,086
Investing activities
Issuance of mortgage loan receivable	0	0	(3,523)
Proceeds from mortgage loan receivable	86	85	21
Distributions of capital from unconsolidated joint ventures	28,240	251	29,405
Investment in unconsolidated joint ventures	(4,705)	(3,505)	(86,685)
Investment in real estate	(219,721)	(750,004)	(187,442)
Acquisition of TPGI, net of cash received	0	0	(54,031)
Proceeds from sale of in-substance real estate	0	24,923	0
Proceeds from sale of real estate	420,190	382,912	191,485
Real estate development	(29,208)	(14,282)	(745)
Improvements to real estate	(89,001)	(52,569)	(35,373)
Cash provided by (used in) investing activities	105,881	(412,189)	(146,888)
Financing activities
Principal payments on mortgage notes payable and debt extinguishments	(180,315)	(53,402)	(73,385)
Proceeds from mortgage notes payable	30,647	481	178,000
Proceeds from bank borrowings	454,850	398,590	542,234
Payments on bank borrowings	(386,350)	(220,090)	(501,234)
Debt financing costs	(2,960)	(3,893)	(2,749)
Purchase of Company stock	0	0	(49)
Dividends paid on common stock	(83,833)	(76,734)	(41,818)
Dividends paid on common units of Operating Partnership	(3,723)	(3,848)	0
Dividends paid on preferred stock	0	0	(3,433)
Acquisition of noncontrolling interests	0	(43,502)	0
Contributions from noncontrolling interest partners	2,125	4,175	0
Distributions to noncontrolling interest partners	(60,016)	(2,713)	(113,178)
Redemption of preferred stock	0	0	(135,532)
Proceeds from stock offerings, net of offering costs	0	417,684	209,768
Other	(234)	0	0
Cash (used in) provided by financing activities	(229,809)	416,748	58,624
Change in cash and cash equivalents	(41,280)	57,563	(23,178)
Cash and cash equivalents at beginning of year	116,241	58,678	81,856
Cash and cash equivalents at end of year	74,961	116,241	58,678
Supplemental cash flow information:
Cash paid for interest	80,744	71,339	43,334
Cash paid for income taxes	2,275	4,792	56
Assets acquired in TPGI merger	0	0	1,202,732
Liabilities assumed in TPGI merger	0	0	122,282
Noncontrolling interests acquired in TPGI merger	0	0	34,230
Shares issued in TPGI merger	0	0	331,260
Issuance of limited voting stock in TPGI merger	0	0	4
Acquisition of Lincoln Place	0	0	68,430
Issuance of Operating Partnership units	0	1,546	96,409
Transfer of assets classified as held for sale	21,373	24,079	16,260
Transfer of liabilities classified as held for sale	1,003	2,035	566
Mortgage loans assumed in purchases	56,140	301,251	727,451
Operating Partnership units converted to common stock	6,337	0	4,302
San Jacinto Center and One Congress Plaza
Acquisitions	0	311,400	0
One Orlando Centre
Acquisitions	$ 0	$ 54,000	$ 0