Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets:
State net operating loss carryforwards	$ 10,617	$ 13,355
Impairment losses	28,496	33,660
Prepaid income from land sales	6,177	3,812
Capital loss carryforwards	4,090
Capitalized costs	2,462	2,851
Reserves and accruals	1,950	1,586
Unrealized losses on investments	359	3,403
Other	1,446	765
Total gross deferred tax assets	55,597	59,432
Valuation allowance	(305)
Total net deferred tax assets	55,292	59,432
Deferred tax liabilities:
Investment in real estate and property and equipment basis differences	14,014	5,929
Deferred gain on land sales and involuntary conversions	33,643	29,101
Installment sales	83,498	83,337
Pension Plan assets transferred to the 401(k) Plan		287
Other	1,396	1,693
Total gross deferred tax liabilities	132,551	120,347
Net deferred tax liabilities	$ (77,259)	$ (60,915)