Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenues	$ 1,800,194	$ 1,787,305	$ 3,487,205	$ 3,316,719
Interest expense	(6,301)	(6,329)	(12,516)	(12,611)
Income before taxes	244,712	241,586	463,319	432,584
Income tax expense	(34,503)	(38,412)	(64,704)	(63,361)
Net income	$ 210,209	$ 203,174	$ 398,615	$ 369,223
Basic earnings per share (USD per share)	$ 58.20	$ 55.90	$ 110.43	$ 101.03
Diluted earnings per share (USD per share)	$ 53.09	$ 49.05	$ 100.61	$ 88.31
Basic weighted average shares outstanding (in shares)	3,612	3,635	3,610	3,655
Diluted weighted average shares outstanding (in shares)	3,959	4,142	3,962	4,181
Home Building [Member]
Revenues	$ 1,757,448	$ 1,750,463	$ 3,400,654	$ 3,240,556
Other income	5,833	2,164	11,570	4,141
Cost of Goods and Services Sold	1,425,388	1,416,797	2,764,194	2,628,743
Selling, general and administrative	(112,210)	(106,517)	(227,944)	(212,064)
Operating income	225,683	229,313	420,086	403,890
Interest expense	(6,033)	(6,047)	(12,026)	(12,054)
Income before taxes	219,650	223,266	408,060	391,836
Mortgage Banking [Member]
Revenues	42,746	36,842	86,551	76,163
Interest income	2,737	2,915	5,570	5,008
Other income	681	641	1,220	1,165
General and administrative	(20,834)	(21,796)	(37,592)	(41,031)
Interest expense	(268)	(282)	(490)	(557)
Income before taxes	$ 25,062	$ 18,320	$ 55,259	$ 40,748