Fair Value Disclosures (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Disclosed at fair value:
Other notes payable	$ 44,159	$ 40,098
Level 2
Disclosed at fair value:
Financial Services debt	270,819	411,821
Senior notes payable	2,463,050	3,375,564
Level 1
Disclosed at fair value:
Cash, cash equivalents, and restricted cash	1,644,054	2,632,235
Fair Value, Measurements, Recurring | Residential mortgage loans available-for-sale | Level 2
Measured at fair value on a recurring basis:
Assets, fair value	495,049	564,979
Measured at fair value on a non-recurring basis:
Assets, fair value	495,049	564,979
Fair Value, Measurements, Recurring | Interest rate lock commitments | Level 2
Measured at fair value on a recurring basis:
Assets, fair value	17,248	16,161
Measured at fair value on a non-recurring basis:
Assets, fair value	17,248	16,161
Fair Value, Measurements, Recurring | Forward contracts | Level 2
Measured at fair value on a recurring basis:
Liabilities, fair value	13,716	(5,436)
Fair Value, Measurements, Recurring | Whole loan commitments | Level 2
Measured at fair value on a recurring basis:
Liabilities, fair value	1,367	(498)
Fair Value, Measurements, Nonrecurring | House and land inventory | Level 3
Measured at fair value on a recurring basis:
Assets, fair value	0	582
Measured at fair value on a non-recurring basis:
Assets, fair value	$ 0	$ 582