Supplemental Guarantor Information (Supplemental Condensed Consolidated Balance Sheet) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017
Assets
Cash and cash equivalents	$ 38,508		$ 32,902	$ 15,927
Cash held in escrow	30,362		24,344
Accounts receivable	17,929		13,464
Inventories	2,093,493		1,848,243
Mortgage loans held for sale	95,321		112,394
Prepaid expenses and other assets	129,925		140,397
Deferred tax assets, net	14,277		13,763
Property and equipment, net	35,258		33,258
Amortizable intangible assets, net	4,094		5,095
Goodwill	30,395		30,395
Total assets	2,489,562		2,254,255
Liabilities:
Accounts payable	78,695		89,907
Accrued expenses and other liabilities	206,818		213,157
Notes payable	896,272		784,777
Revolving line of credit	278,800		202,500
Mortgage repurchase facilities	77,798		104,555
Total liabilities	1,538,383		1,394,896
Stockholders' equity:	951,179	$ 897,229	859,359	840,793	$ 803,706	$ 735,233
Total liabilities and stockholders' equity	2,489,562		2,254,255
Century [Member]
Assets
Cash and cash equivalents	1,894		2,183
Accounts receivable	4,043		6,117
Investment in consolidated subsidiaries	2,107,232		1,827,456
Prepaid expenses and other assets	8,451		51,177
Deferred tax assets, net	14,277		13,763
Property and equipment, net	15,179		13,274
Total assets	2,151,076		1,913,970
Liabilities:
Accounts payable	190		623
Accrued expenses and other liabilities	30,785		75,506
Notes payable	890,122		775,982
Revolving line of credit	278,800		202,500
Total liabilities	1,199,897		1,054,611
Stockholders' equity:	951,179		859,359
Total liabilities and stockholders' equity	2,151,076		1,913,970
Guarantor Subsidiaries [Member]
Assets
Cash and cash equivalents	2,125		2,101	8,922
Cash held in escrow	30,362		24,344
Accounts receivable	13,989		7,424
Inventories	2,093,493		1,848,243
Prepaid expenses and other assets	108,265		85,224
Property and equipment, net	19,247		18,989
Amortizable intangible assets, net	4,094		5,095
Goodwill	30,395		30,395
Total assets	2,301,970		2,021,815
Liabilities:
Accounts payable	77,882		88,627
Accrued expenses and other liabilities	166,443		131,548
Notes payable	6,150		8,795
Total liabilities	250,475		228,970
Stockholders' equity:	2,051,495		1,792,845
Total liabilities and stockholders' equity	2,301,970		2,021,815
Non Guarantor Subsidiaries [Member]
Assets
Cash and cash equivalents	34,489		28,618	23,585
Accounts receivable	(103)		(77)
Mortgage loans held for sale	95,321		112,394
Prepaid expenses and other assets	13,209		3,996
Property and equipment, net	832		995
Total assets	143,748		145,926
Liabilities:
Accounts payable	623		657
Accrued expenses and other liabilities	9,590		6,103
Mortgage repurchase facilities	77,798		104,555
Total liabilities	88,011		111,315
Stockholders' equity:	55,737		34,611
Total liabilities and stockholders' equity	143,748		145,926
Elimination Entries [Member]
Assets
Cash and cash equivalents				$ (16,580)
Investment in consolidated subsidiaries	(2,107,232)		(1,827,456)
Total assets	(2,107,232)		(1,827,456)
Liabilities:
Stockholders' equity:	(2,107,232)		(1,827,456)
Total liabilities and stockholders' equity	$ (2,107,232)		$ (1,827,456)