Supplemental Guarantor Information (Supplemental Condensed Consolidated Statement Of Operations) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenues
Total revenues	$ 561,729	$ 379,716	$ 1,495,467	$ 899,855
Selling, general, and administrative	(70,975)	(46,165)	(191,130)	(113,597)
Acquisition expense	(58)	(7,205)	(395)	(8,645)
Equity in income of unconsolidated subsidiaries		3,716	14,849	7,648
Other income (expense)	(545)	1,013	(553)	2,274
Income before income tax expense	22,858	15,156	92,468	50,316
Income tax expense	(5,810)	(5,686)	(22,207)	(17,216)
Net income	17,048	9,470	70,261	33,100
Century [Member]
Revenues
Selling, general, and administrative	(20,187)	(13,342)	(53,802)	(30,876)
Acquisition expense	(58)	(7,205)	(395)	(8,645)
Equity in earnings from consolidated subsidiaries	32,282	20,470	97,688	52,869
Equity in income of unconsolidated subsidiaries		3,716	14,849	7,648
Other income (expense)	61	495	(194)	852
Income before income tax expense	12,098	4,134	58,146	21,848
Income tax expense	4,950	5,336	12,115	11,252
Net income	17,048	9,470	70,261	33,100
Guarantor Subsidiaries [Member]
Revenues
Total revenues	554,007	376,761	1,474,175	895,158
Selling, general, and administrative	(50,788)	(32,823)	(137,328)	(82,721)
Other income (expense)	(606)	518	(359)	1,386
Income before income tax expense	41,376	30,987	126,554	81,252
Income tax expense	(10,344)	(10,845)	(32,904)	(28,438)
Net income	31,032	20,142	93,650	52,814
Non Guarantor Subsidiaries [Member]
Revenues
Total revenues	7,722	2,955	21,292	4,697
Other income (expense)				36
Income before income tax expense	1,666	505	5,456	85
Income tax expense	(416)	(177)	(1,418)	(30)
Net income	1,250	328	4,038	55
Elimination Entries [Member]
Revenues
Equity in earnings from consolidated subsidiaries	(32,282)	(20,470)	(97,688)	(52,869)
Income before income tax expense	(32,282)	(20,470)	(97,688)	(52,869)
Net income	(32,282)	(20,470)	(97,688)	(52,869)
Home Sales [Member]
Revenues
Total revenues	552,876	374,935	1,469,871	888,942
Cost of revenues	(460,144)	(311,365)	(1,206,924)	(727,577)
Home Sales [Member] | Guarantor Subsidiaries [Member]
Revenues
Total revenues	552,876	374,935	1,469,871	888,942
Cost of revenues	(460,144)	(311,365)	(1,206,924)	(727,577)
Land Sales And Other [Member]
Revenues
Total revenues	1,131	1,826	4,304	6,216
Cost of revenues	(1,093)	(2,104)	(3,010)	(4,994)
Land Sales And Other [Member] | Guarantor Subsidiaries [Member]
Revenues
Total revenues	1,131	1,826	4,304	6,216
Cost of revenues	(1,093)	(2,104)	(3,010)	(4,994)
Homebuilding [Member]
Revenues
Total revenues	554,007	376,761	1,474,175	895,158
Cost of revenues	(461,237)	(313,469)	(1,209,934)	(732,571)
Homebuilding [Member] | Guarantor Subsidiaries [Member]
Revenues
Total revenues	554,007	376,761	1,474,175	895,158
Cost of revenues	(461,237)	(313,469)	(1,209,934)	(732,571)
Financial Services [Member]
Revenues
Total revenues	7,722	2,955	21,292	4,697
Cost of revenues	(6,056)	(2,450)	(15,836)	(4,648)
Financial Services [Member] | Non Guarantor Subsidiaries [Member]
Revenues
Total revenues	7,722	2,955	21,292	4,697
Cost of revenues	$ (6,056)	$ (2,450)	$ (15,836)	$ (4,648)