Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenues	$ 1,990,012	$ 1,911,264	$ 5,192,908	$ 5,398,469
Interest expense	(11,687)	(6,293)	(27,698)	(18,809)
Income before taxes	321,457	267,174	692,663	730,493
Income tax expense	(64,991)	(43,387)	(96,419)	(108,091)
Net income	$ 256,466	$ 223,787	$ 596,244	$ 622,402
Basic earnings per share (USD per share)	$ 69.19	$ 60.94	$ 161.85	$ 171.43
Diluted earnings per share (USD per share)	$ 65.11	$ 56.11	$ 153.03	$ 156.61
Basic weighted average shares outstanding (in shares)	3,706	3,672	3,684	3,631
Diluted weighted average shares outstanding (in shares)	3,939	3,988	3,896	3,974
Home Building [Member]
Revenues	$ 1,920,751	$ 1,873,331	$ 5,065,216	$ 5,273,985
Other income	1,988	6,696	9,732	18,266
Cost of Goods and Services Sold	1,536,044	1,518,276	4,115,280	4,282,470
Selling, general and administrative	(105,741)	(109,969)	(318,610)	(337,913)
Operating income	280,954	251,782	641,058	671,868
Interest expense	(11,309)	(6,008)	(26,689)	(18,034)
Income before taxes	269,645	245,774	614,369	653,834
Mortgage Banking [Member]
Revenues	69,261	37,933	127,692	124,484
Interest income	2,222	3,340	6,545	8,910
Other income	887	819	2,215	2,039
General and administrative	(20,180)	(20,407)	(57,149)	(57,999)
Interest expense	(378)	(285)	(1,009)	(775)
Income before taxes	$ 51,812	$ 21,400	$ 78,294	$ 76,659