Supplemental Guarantor Information (Supplemental Condensed Consolidated Balance Sheet) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Assets
Cash and cash equivalents	$ 31,704		$ 32,902	$ 19,482
Cash held in escrow	25,838		24,344
Accounts receivable	15,999		13,464
Inventories	2,009,769		1,848,243
Mortgage loans held for sale	122,085		114,074
Prepaid expenses and other assets	123,343		138,717
Deferred tax assets, net	13,335		13,763
Property and equipment, net	33,469		33,258
Amortizable intangible assets, net	4,436		5,095
Goodwill	30,395		30,395
Total assets	2,410,373		2,254,255
Liabilities:
Accounts payable	97,043		89,907
Accrued expenses and other liabilities	212,750		213,157
Notes payable	890,606		784,777
Revolving line of credit	212,000		202,500
Mortgage repurchase facilities	100,745		104,555
Total liabilities	1,513,144		1,394,896
Stockholders' equity:	897,229	$ 875,406	859,359	803,706	$ 757,418	$ 735,233
Total liabilities and stockholders' equity	2,410,373		2,254,255
Century [Member]
Assets
Cash and cash equivalents	5,252		2,183
Accounts receivable	5,418		6,117
Investment in consolidated subsidiaries	1,979,614		1,827,456
Prepaid expenses and other assets	10,421		51,177
Deferred tax assets, net	13,335		13,763
Property and equipment, net	14,145		13,274
Total assets	2,028,185		1,913,970
Liabilities:
Accounts payable	694		623
Accrued expenses and other liabilities	28,166		75,506
Notes payable	890,096		775,982
Revolving line of credit	212,000		202,500
Total liabilities	1,130,956		1,054,611
Stockholders' equity:	897,229		859,359
Total liabilities and stockholders' equity	2,028,185		1,913,970
Guarantor Subsidiaries [Member]
Assets
Cash and cash equivalents			2,101	8,343
Cash held in escrow	25,838		24,344
Accounts receivable	10,626		7,424
Inventories	2,009,769		1,848,243
Prepaid expenses and other assets	103,075		85,224
Property and equipment, net	18,447		18,989
Amortizable intangible assets, net	4,436		5,095
Goodwill	30,395		30,395
Total assets	2,202,586		2,021,815
Liabilities:
Accounts payable	96,107		88,627
Accrued expenses and other liabilities	174,819		131,548
Notes payable	510		8,795
Total liabilities	271,436		228,970
Stockholders' equity:	1,931,150		1,792,845
Total liabilities and stockholders' equity	2,202,586		2,021,815
Non Guarantor Subsidiaries [Member]
Assets
Cash and cash equivalents	26,902		28,618	18,258
Accounts receivable	(45)		(77)
Mortgage loans held for sale	122,085		114,074
Prepaid expenses and other assets	9,847		2,316
Property and equipment, net	877		995
Total assets	159,666		145,926
Liabilities:
Accounts payable	692		657
Accrued expenses and other liabilities	9,765		6,103
Mortgage repurchase facilities	100,745		104,555
Total liabilities	111,202		111,315
Stockholders' equity:	48,464		34,611
Total liabilities and stockholders' equity	159,666		145,926
Elimination Entries [Member]
Assets
Cash and cash equivalents	(450)			$ (7,119)
Investment in consolidated subsidiaries	(1,979,614)		(1,827,456)
Total assets	(1,980,064)		(1,827,456)
Liabilities:
Accounts payable	(450)
Total liabilities	(450)
Stockholders' equity:	(1,979,614)		(1,827,456)
Total liabilities and stockholders' equity	$ (1,980,064)		$ (1,827,456)