Segment Information - Schedule of Reconciliation of Net Income Attributable to Parent (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Business Acquisition [Line Items]
Net income (loss) attributable to common shareholders	$ (3,040)	$ 20,574	$ 21,821	$ 16,384
Depreciation and amortization	45,995	48,117	94,714	97,277
Corporate and other	11,559	8,603	23,873	17,017
Third-party real estate services	28,710	21,189	56,776	43,798
Share-based compensation related to Formation Transaction and special equity awards	9,523	9,097	20,654	18,525
Transaction and other costs	2,974	3,787	7,869	8,008
Interest expense	13,107	18,027	30,281	37,284
Loss on extinguishment of debt	1,889	4,457	1,889	4,457
Reduction of gain on bargain purchase	0	(7,606)	0	(7,606)
Income tax benefit	51	313	(1,121)	(595)
Net (income) loss attributable to redeemable noncontrolling interests	(288)	3,574	3,099	2,980
Third-party real estate services, including reimbursements	29,487	24,160	57,178	48,490
Other Income, Excluding Parking Income	2,114	2,080	3,755	3,196
Income (loss) from unconsolidated real estate ventures, net	(1,810)	3,836	1,791	1,934
Interest and other income, net	2,052	513	3,003	1,086
Gain on sale of real estate	0	33,396	39,033	33,851
Net loss attributable to noncontrolling interests	0	125	0	127
Consolidated NOI	78,637	81,234	155,095	164,057
Parking Income	$ 6,700	$ 6,600	$ 13,100	$ 13,000