Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenues	$ 1,620,368	$ 1,800,194	$ 3,202,896	$ 3,487,205
Interest expense	(9,525)	(6,301)	(16,011)	(12,516)
Income before taxes	209,831	244,712	371,206	463,319
Income tax expense	(45,756)	(34,503)	(31,428)	(64,704)
Net income	$ 164,075	$ 210,209	$ 339,778	$ 398,615
Basic earnings per share (USD per share)	$ 44.56	$ 58.20	$ 92.52	$ 110.43
Diluted earnings per share (USD per share)	$ 42.50	$ 53.09	$ 87.56	$ 100.61
Basic weighted average shares outstanding (in shares)	3,682	3,612	3,673	3,610
Diluted weighted average shares outstanding (in shares)	3,861	3,959	3,881	3,962
Home Building [Member]
Revenues	$ 1,588,758	$ 1,757,448	$ 3,144,465	$ 3,400,654
Other income	2,408	5,833	7,744	11,570
Cost of Goods and Services Sold	1,284,493	1,425,388	2,579,236	2,764,194
Selling, general and administrative	(102,702)	(112,210)	(212,869)	(227,944)
Operating income	203,971	225,683	360,104	420,086
Interest expense	(9,166)	(6,033)	(15,380)	(12,026)
Income before taxes	194,805	219,650	344,724	408,060
Mortgage Banking [Member]
Revenues	31,610	42,746	58,431	86,551
Interest income	1,854	2,737	4,323	5,570
Other income	679	681	1,328	1,220
General and administrative	(18,758)	(20,834)	(36,969)	(37,592)
Interest expense	(359)	(268)	(631)	(490)
Income before taxes	$ 15,026	$ 25,062	$ 26,482	$ 55,259