Condensed Consolidated Statements of Operations - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
REVENUES:
Revenue from customers	$ 8,065,000	$ 11,629,000	$ 41,012,000	$ 36,450,000
Revenues	8,377,000	12,014,000	41,904,000	37,474,000
COSTS AND EXPENSES:
Selling, general, and administrative	17,656,000	25,863,000	58,594,000	77,629,000
Total costs and expenses	24,540,000	34,950,000	91,450,000	104,911,000
OTHER INCOME:
Interest income	71,000	1,724,000	1,303,000	6,494,000
Gain on settlement of contingent consideration—related party	0	0	0	64,870,000
Miscellaneous	91,000	7,000	267,000	26,000
Total other income	162,000	1,731,000	1,570,000	71,390,000
EQUITY IN EARNINGS (LOSS) FROM UNCONSOLIDATED ENTITIES	52,423,000	(1,750,000)	45,417,000	4,463,000
INCOME (LOSS) BEFORE INCOME TAX (PROVISION) BENEFIT	36,422,000	(22,955,000)	(2,559,000)	8,416,000
INCOME TAX (PROVISION) BENEFIT	0	0	0	(1,266,000)
NET INCOME (LOSS)	36,422,000	(22,955,000)	(2,559,000)	7,150,000
LESS NET INCOME (LOSS) ATTRIBUTABLE TO NONCONTROLLING INTERESTS	19,458,000	(12,292,000)	(1,349,000)	4,517,000
NET INCOME (LOSS) ATTRIBUTABLE TO THE COMPANY	$ 16,964,000	$ (10,663,000)	$ (1,210,000)	$ 2,633,000
Common Class A
NET INCOME (LOSS) ATTRIBUTABLE TO THE COMPANY PER CLASS A SHARE
Basic (in dollars per share)	$ 0.25	$ (0.16)	$ (0.02)	$ 0.04
Diluted (in dollar per share)	$ 0.25	$ (0.16)	$ (0.02)	$ 0.04
WEIGHTED AVERAGE SHARES OUTSTANDING
Basic (in shares)	66,746,065	66,276,694	66,709,190	66,248,431
Diluted (in shares)	142,866,245	66,276,694	68,848,283	145,456,670
Common Class B
NET INCOME (LOSS) ATTRIBUTABLE TO THE COMPANY PER CLASS A SHARE
Basic (in dollars per share)	$ 0.00	$ (0.00)	$ (0.00)	$ 0.00
Diluted (in dollar per share)	$ 0.00	$ (0.00)	$ (0.00)	$ 0.00
WEIGHTED AVERAGE SHARES OUTSTANDING
Basic (in shares)	79,233,544	79,275,234	79,233,544	79,204,883
Diluted (in shares)	79,233,544	79,275,234	79,233,544	79,276,016
NET INCOME (LOSS) ATTRIBUTABLE TO THE COMPANY PER CLASS B SHARE
Basic and diluted (in dollars per share)	$ 0.00	$ (0.00)		$ 0.00
Land sales
REVENUES:
Revenue from customers	$ 42,000	$ 9,000	$ 17,076,000	$ 74,000
COSTS AND EXPENSES:
Cost and expenses	0	0	11,861,000	0
Land sales | Affiliated Entity
REVENUES:
Revenue from customers	2,000	229,000	14,000	695,000
Management services—related party
COSTS AND EXPENSES:
Cost and expenses	6,120,000	7,699,000	16,587,000	22,794,000
Management services—related party | Affiliated Entity
REVENUES:
Revenue from customers	7,999,000	11,458,000	22,557,000	33,689,000
Operating properties
REVENUES:
Revenue from customers	22,000	(67,000)	1,365,000	1,992,000
Revenues	334,000	318,000	2,257,000	3,016,000
COSTS AND EXPENSES:
Cost and expenses	$ 764,000	$ 1,388,000	$ 4,408,000	$ 4,488,000