Supplemental Guarantor Information (Supplemental Condensed Consolidated Balance Sheet) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Assets
Cash and cash equivalents	$ 55,436	$ 32,902	$ 88,832
Cash held in escrow	35,308	24,344
Accounts receivable	27,438	13,464
Inventories	1,995,549	1,848,243
Mortgage loans held for sale	185,246	112,394
Prepaid expenses and other assets	123,800	140,397
Deferred tax assets, net	10,589	13,763
Property and equipment, net	35,998	33,258
Amortizable intangible assets, net	208	5,095
Goodwill	30,395	30,395
Total assets	2,499,967	2,254,255
Liabilities:
Accounts payable	84,794	89,907
Accrued expenses and other liabilities	213,975	213,157
Notes payable	896,704	784,777
Revolving line of credit	68,700	202,500
Mortgage repurchase facilities	174,095	104,555
Total liabilities	1,438,268	1,394,896
Stockholders' equity:	1,061,699	859,359	735,233	$ 473,636
Total liabilities and stockholders' equity	2,499,967	2,254,255
Parent
Assets
Cash and cash equivalents	1,577	2,183	56,234
Accounts receivable	15,363	6,117
Investment in consolidated subsidiaries	1,996,703	1,827,456
Prepaid expenses and other assets	9,539	51,177
Deferred tax assets, net	10,589	13,763
Property and equipment, net	15,256	13,274
Total assets	2,049,027	1,913,970
Liabilities:
Accounts payable	(13)	623
Accrued expenses and other liabilities	28,214	75,506
Notes payable	890,427	775,982
Revolving line of credit	68,700	202,500
Total liabilities	987,328	1,054,611
Stockholders' equity:	1,061,699	859,359
Total liabilities and stockholders' equity	2,049,027	1,913,970
Guarantor Subsidiaries [Member]
Assets
Cash and cash equivalents		2,101	23,399
Cash held in escrow	35,308	24,344
Accounts receivable	12,327	7,424
Inventories	1,995,549	1,848,243
Prepaid expenses and other assets	101,113	85,224
Property and equipment, net	19,614	18,989
Amortizable intangible assets, net	208	5,095
Goodwill	30,395	30,395
Total assets	2,194,514	2,021,815
Liabilities:
Accounts payable	83,853	88,627
Accrued expenses and other liabilities	173,403	131,548
Notes payable	6,277	8,795
Total liabilities	263,533	228,970
Stockholders' equity:	1,930,981	1,792,845
Total liabilities and stockholders' equity	2,194,514	2,021,815
Non Guarantor Subsidiaries [Member]
Assets
Cash and cash equivalents	53,859	28,618	$ 9,199
Accounts receivable	(252)	(77)
Mortgage loans held for sale	185,246	112,394
Prepaid expenses and other assets	13,148	3,996
Property and equipment, net	1,128	995
Total assets	253,129	145,926
Liabilities:
Accounts payable	954	657
Accrued expenses and other liabilities	12,358	6,103
Mortgage repurchase facilities	174,095	104,555
Total liabilities	187,407	111,315
Stockholders' equity:	65,722	34,611
Total liabilities and stockholders' equity	253,129	145,926
Elimination Entries [Member]
Assets
Investment in consolidated subsidiaries	(1,996,703)	(1,827,456)
Total assets	(1,996,703)	(1,827,456)
Liabilities:
Stockholders' equity:	(1,996,703)	(1,827,456)
Total liabilities and stockholders' equity	$ (1,996,703)	$ (1,827,456)