Revenues (Schedule of Disaggregation of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Rental revenue	$ 70,072	$ 70,344	$ 241,522	$ 206,168
Total revenues	154,440	231,172	485,788	1,016,378
Recognized at a point in time
Disaggregation of Revenue [Line Items]
Revenues	48,620	97,027	162,174	645,156
Recognized at a point in time and/or over time
Disaggregation of Revenue [Line Items]
Revenues	35,748	63,801	82,092	165,054
Operating Assets revenues
Disaggregation of Revenue [Line Items]
Total revenues	81,667	104,223	280,201	305,395
Master Planned Communities revenues
Disaggregation of Revenue [Line Items]
Total revenues	52,158	92,287	171,517	216,042
Seaport District
Disaggregation of Revenue [Line Items]
Total revenues	4,204	23,130	16,170	43,051
Strategic Developments revenues
Disaggregation of Revenue [Line Items]
Total revenues	16,365	11,515	17,749	451,873
Corporate revenues
Disaggregation of Revenue [Line Items]
Total revenues	46	17	151	17
Condominium rights and unit sales
Disaggregation of Revenue [Line Items]
Revenues	142	9,999	185	443,931
Condominium rights and unit sales | Recognized at a point in time
Disaggregation of Revenue [Line Items]
Revenues	142	9,999	185	443,931
Master Planned Communities land sales
Disaggregation of Revenue [Line Items]
Revenues	39,248	77,368	136,053	177,001
Master Planned Communities land sales | Recognized at a point in time
Disaggregation of Revenue [Line Items]
Revenues	39,248	77,368	136,053	177,001
Builder price participation
Disaggregation of Revenue [Line Items]
Revenues	9,230	9,660	25,936	24,224
Builder price participation | Recognized at a point in time
Disaggregation of Revenue [Line Items]
Revenues	9,230	9,660	25,936	24,224
Other rental and property revenues
Disaggregation of Revenue [Line Items]
Revenues	35,748	63,801	82,092	165,054
Other rental and property revenues | Recognized at a point in time and/or over time
Disaggregation of Revenue [Line Items]
Revenues	$ 35,748	$ 63,801	$ 82,092	$ 165,054