Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities:
Net income	$ 117,797,000	$ 64,302,000	$ 64,535,000
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization expense	3,666,000	3,079,000	2,943,000
Share-based compensation expense	2,097,000	2,191,000	1,774,000
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability	368,000	4,906,000	1,693,000
Deferred income taxes, net	(114,000)	1,237,000	14,712,000
Income (Loss) from Equity Method Investments	(16,654,000)	(9,809,000)	(7,259,000)
Allowances For Option Deposits And Pre-Acquisition Costs	1,513,000	884,000	663,000
Distributions of income from unconsolidated entities	10,936,000	5,084,000	4,623,000
Changes in operating assets and liabilities:
(Increase) decrease in receivables	(504,000)	122,000	(3,029,000)
Increase in inventory	(90,345,000)	(83,970,000)	(129,291,000)
(Increase) decrease in earnest money deposits	(9,069,000)	2,107,000	2,119,000
Increase in other assets	(3,739,000)	(2,409,000)	(3,404,000)
(Decrease) increase in accounts payable	(5,523,000)	3,953,000	(483,000)
Increase (decrease) in accrued expenses	15,760,000	(4,384,000)	9,470,000
Payment for Contingent Consideration Liability, Operating Activities	(5,267,000)	(1,332,000)	0
Increase (Decrease) in Contract with Customer, Liability	14,177,000	(8,024,000)	1,458,000
Net cash provided by (used in) operating activities	35,099,000	(22,063,000)	(39,476,000)
Payments to Acquire Businesses, Net of Cash Acquired	0	0	(26,861,000)
Cash flows from investing activities:
Investments in unconsolidated entities	(10,431,000)	(5,300,000)	(755,000)
Purchase of property and equipment	(2,867,000)	(2,569,000)	(3,211,000)
Net cash used in investing activities	(13,298,000)	(7,869,000)	(30,827,000)
Cash flows from financing activities:
Borrowings from lines of credit	354,500,000	224,000,000	165,000,000
Proceeds from Issuance of Senior Long-term Debt	37,500,000	75,000,000	0
Payments of Debt Issuance Costs	(527,000)	(1,974,000)	(870,000)
Repayments of lines of credit	(412,500,000)	(260,000,000)	(70,000,000)
Proceeds from Notes Payable	10,714,000	0	0
Repayments of notes payable	(8,590,000)	0	(10,226,000)
Payment for Contingent Consideration Liability, Financing Activities	0	(514,000)	0
Payments of withholding tax on vesting of restricted stock awards	(592,000)	(544,000)	(412,000)
Payments for Repurchase of Common Stock	0	(2,186,000)	(981,000)
Contributions from noncontrolling interests	400,000	3,600,000	5,000
Distributions to noncontrolling interests	(5,251,000)	(10,993,000)	(10,747,000)
Proceeds from (Payments for) Other Financing Activities	(1,505,000)	(527,000)	0
Net cash (used in) provided by financing activities	(25,851,000)	25,862,000	71,769,000
Net (decrease) increase in cash and cash equivalents and restricted cash	(4,050,000)	(4,070,000)	1,466,000
Restricted Cash	14,156,000	4,416,000	3,440,000
Cash	19,479,000	33,269,000	38,315,000
Cash and restricted cash	33,635,000	37,685,000	41,755,000
Supplemental disclosure of cash flow information:
Cash paid for interest, net of capitalized interest	0	0	0
Cash paid for income taxes, net of refunds	$ 20,541,000	$ 14,313,000	$ 4,611,000