Segment Information (Total Assets And Inventory By Reportable Segment) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information
Homes under construction	$ 2,421,405	$ 1,921,259	$ 1,408,260
Land under development	4,135,814	4,072,109	3,259,066
Raw land	589,911	777,287	782,732
House and land inventory	7,147,130	6,770,655	5,450,058
Total assets	9,686,649	10,178,200	9,189,406
Northeast [Member]
Segment Reporting Information
Homes under construction	234,413	175,253	163,173
Land under development	327,599	375,899	292,631
Raw land	73,574	135,447	121,522
House and land inventory	635,586	686,599	577,326
Total assets	791,511	798,369	688,610
Southeast [Member]
Segment Reporting Information
Homes under construction	433,411	354,047	196,456
Land under development	613,626	650,805	367,577
Raw land	121,238	148,793	139,246
House and land inventory	1,168,275	1,153,645	703,279
Total assets	1,287,992	1,243,188	765,933
Florida [Member]
Segment Reporting Information
Homes under construction	359,651	309,525	227,910
Land under development	876,856	683,376	574,092
Raw land	109,069	183,168	97,185
House and land inventory	1,345,576	1,176,069	899,187
Total assets	1,481,837	1,330,847	1,013,543
Texas [Member]
Segment Reporting Information
Homes under construction	251,613	219,606	191,424
Land under development	435,018	413,312	317,702
Raw land	87,392	74,750	107,737
House and land inventory	774,023	707,668	616,863
Total assets	859,847	793,917	691,342
Midwest [Member]
Segment Reporting Information
Homes under construction	299,896	256,649	197,738
Land under development	476,694	474,287	414,386
Raw land	28,482	50,302	68,918
House and land inventory	805,072	781,238	681,042
Total assets	877,282	851,457	734,834
West [Member]
Segment Reporting Information
Homes under construction	798,706	580,082	413,208
Land under development	1,137,940	1,226,190	1,094,112
Raw land	147,493	159,387	222,920
House and land inventory	2,084,139	1,965,659	1,730,240
Total assets	2,271,328	2,200,058	1,924,958
Other Homebuilding [Member]
Segment Reporting Information
Homes under construction	43,715	26,097	18,351
Land under development	268,081	248,240	198,566
Raw land	22,663	25,440	25,204
House and land inventory	334,459	299,777	242,121
Total assets	1,469,234	2,351,082	2,861,197
Homebuilding [Member]
Segment Reporting Information
Homes under construction	2,421,405	1,921,259	1,408,260
Land under development	4,135,814	4,072,109	3,259,066
Raw land	589,911	777,287	782,732
House and land inventory	7,147,130	6,770,655	5,450,058
Total assets	9,039,031	9,568,918	8,680,417
Financial Services [Member]
Segment Reporting Information
Total assets	$ 647,618	$ 609,282	$ 508,989