Basis of Presentation - Variable Interest Entity Disclosure (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Assets
Real estate — Land, buildings and improvements	$ 1,200,507	$ 1,210,776
Operating real estate — Land, buildings and improvements	507,071	503,149
Real estate under construction	180,558	152,106
In-place lease intangible assets	250,765	252,316
Right-of-use and other intangible assets	47,200	33,144
Accumulated depreciation and amortization	(292,718)	(280,608)
Cash and cash equivalents	140,142	170,914
Accounts receivable and other assets, net	192,233	197,403
Total assets	2,267,587	2,304,553
Liabilities
Non-recourse mortgages, net, including debt attributable to Assets held for sale (Note 4)	1,061,243	1,098,281
Bonds payable, net	140,750	139,146
Accounts payable, accrued expenses and other liabilities	139,736	132,065
Total liabilities	1,377,035	1,408,583
VIE
Assets
Real estate — Land, buildings and improvements	360,902	362,536
Operating real estate — Land, buildings and improvements	114,144	110,543
Real estate under construction	179,943	151,479
In-place lease intangible assets	85,120	86,011
Right-of-use and other intangible assets	23,698	17,223
Accumulated depreciation and amortization	(71,687)	(68,534)
Cash and cash equivalents	13,307	18,092
Accounts receivable and other assets, net	22,393	27,625
Total assets	727,820	704,975
Liabilities
Non-recourse mortgages, net, including debt attributable to Assets held for sale (Note 4)	278,570	284,669
Bonds payable, net	57,872	57,253
Accounts payable, accrued expenses and other liabilities	51,861	50,061
Total liabilities	$ 388,303	$ 391,983