Condensed Consolidated Statements of Cash Flows - USD ($)	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash flows from operating activities:
Net income	$ 137,304,000	$ 87,507,000
Depreciation, Depletion and Amortization	2,075,000	2,461,000
Gain (Loss) on Disposition of Property Plant Equipment	195,000	31,000
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Share-based compensation expense	2,917,000	1,958,000
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability	0	210,000
Earnest Money Deposits and Pre-acquisition Costs Written-Off	210,000	1,490,000
Deferred income taxes, net	0	(115,000)
Income (Loss) from Equity Method Investments	(14,039,000)	(13,038,000)
Distributions of income from unconsolidated entities	7,755,000	7,444,000
Changes in operating assets and liabilities:
Increase in receivables	(1,805,000)	(931,000)
Increase in inventory	(325,086,000)	(25,263,000)
Increase in earnest money deposits	(4,166,000)	(9,067,000)
Decrease (increase) in other assets	617,000	(6,951,000)
Increase (decrease) in accounts payable	(23,793,000)	6,917,000
Increase in accrued expenses	24,151,000	25,191,000
Increase (Decrease) in Contract with Customer, Liability	31,948,000	5,385,000
Net cash (used in) provided by operating activities	(114,499,000)	64,128,000
Cash flows from investing activities:
Purchase of property and equipment, net of disposals	(1,782,000)	(1,738,000)
Net cash used in investing activities	(1,790,000)	(12,085,000)
Net Cash Provided by (Used in) Financing Activities [Abstract]
Borrowings from lines of credit	506,000,000	217,500,000
Repayments of Lines of Credit	490,000,000	289,000,000
Payment, Tax Withholding, Share-based Payment Arrangement	834,000	592,000
Contributions of LLC Members	0	400,000
Payments to Noncontrolling Interests	1,606,000	5,251,000
Net cash provided by (used in) financing activities	135,657,000	(38,879,000)
Net increase in cash and cash equivalents and restricted cash	19,368,000	13,164,000
Cash and cash equivalents, beginning of period		33,269,000
Restricted cash, beginning of period	14,156,000	4,416,000
Cash and cash equivalents and restricted cash, beginning of period	33,635,000	37,685,000
Cash and cash equivalents, end of period		40,269,000
Restricted cash, end of period	31,442,000	10,580,000
Cash and cash equivalents and restricted cash, end of period	53,003,000	50,849,000
Supplemental Cash Flow Information [Abstract]
Interest Paid, Excluding Capitalized Interest, Operating Activities	0	0
Income Taxes Paid, Net	32,485,000	10,181,000
Earnest Money Deposits and Pre-acquisition Costs Written-Off	210,000	1,490,000
Proceeds from Notes Payable	127,000	10,715,000
Repayments of Notes Payable	(2,030,000)	(8,584,000)
Payments of Debt Issuance Costs	(894,000)	(62,000)
Payments for Repurchase of Redeemable Noncontrolling Interest	(106,000)	(1,505,000)
Payment for Contingent Consideration Liability, Operating Activities	(368,000)	(5,267,000)
Payments to Acquire Equity Method Investments	(8,000)	(10,347,000)
Proceeds from Issuance of Senior Long-term Debt	$ 125,000,000	$ 37,500,000