Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenues	$ 1,911,264	$ 1,852,407	$ 5,398,469	$ 5,169,126
Interest expense	(6,293)	(6,197)	(18,809)	(18,808)
Income before taxes	267,174	249,710	730,493	682,294
Income tax expense	(43,387)	(53,894)	(108,091)	(117,255)
Net income	$ 223,787	$ 195,816	$ 622,402	$ 565,039
Basic earnings per share (USD per share)	$ 60.94	$ 54.21	$ 171.43	$ 155.22
Diluted earnings per share (USD per share)	$ 56.11	$ 48.28	$ 156.61	$ 136.53
Basic weighted average shares outstanding (in shares)	3,672	3,612	3,631	3,640
Diluted weighted average shares outstanding (in shares)	3,988	4,056	3,974	4,139
Home Building [Member]
Revenues	$ 1,873,331	$ 1,809,345	$ 5,273,985	$ 5,049,901
Other income	6,696	2,840	18,266	6,981
Cost of Goods and Services Sold	1,518,276	1,472,649	4,282,470	4,101,392
Selling, general and administrative	(109,969)	(109,372)	(337,913)	(321,436)
Operating income	251,782	230,164	671,868	634,054
Interest expense	(6,008)	(5,968)	(18,034)	(18,022)
Income before taxes	245,774	224,196	653,834	616,032
Mortgage Banking [Member]
Revenues	37,933	43,062	124,484	119,225
Interest income	3,340	3,362	8,910	8,370
Other income	819	659	2,039	1,824
General and administrative	(20,407)	(21,340)	(57,999)	(62,371)
Interest expense	(285)	(229)	(775)	(786)
Income before taxes	$ 21,400	$ 25,514	$ 76,659	$ 66,262