Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenues	$ 1,687,011	$ 1,529,414
Interest expense	(6,215)	(6,282)
Income before taxes	218,607	190,998
Income tax expense	(30,201)	(24,949)
Net income	$ 188,406	$ 166,049
Basic earnings per share (USD per share)	$ 52.23	$ 45.19
Diluted earnings per share (USD per share)	$ 47.64	$ 39.34
Basic weighted average shares outstanding (in shares)	3,607	3,675
Diluted weighted average shares outstanding (in shares)	3,955	4,220
Home Building [Member]
Revenues	$ 1,643,206	$ 1,490,093
Other income	5,737	1,977
Cost of Goods and Services Sold	1,338,806	1,211,946
Selling, general and administrative	(115,734)	(105,547)
Operating income	194,403	174,577
Interest expense	(5,993)	(6,007)
Income before taxes	188,410	168,570
Mortgage Banking [Member]
Revenues	43,805	39,321
Interest income	2,833	2,093
Other income	539	524
General and administrative	(16,758)	(19,235)
Interest expense	(222)	(275)
Income before taxes	$ 30,197	$ 22,428