Results of Quarterly Operations (Schedule Of Quarterly Financial Information) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenues									$ 4,216,314	$ 3,161,192	$ 2,535,911
Income before income tax expense	$ 212,177	$ 145,761	$ 152,134	$ 131,049	$ 121,164	$ 64,885	$ 50,103	$ 34,088	641,122	270,240	132,635
Net income	$ 164,965	$ 113,977	$ 117,910	$ 101,652	$ 91,817	$ 49,764	$ 38,450	$ 26,126	$ 498,504	$ 206,157	$ 112,994
Basic earnings per share	$ 4.89	$ 3.38	$ 3.49	$ 3.03	$ 2.75	$ 1.49	$ 1.15	$ 0.79	$ 14.79	$ 6.19	$ 3.66
Diluted earnings per share	$ 4.78	$ 3.31	$ 3.47	$ 3.00	$ 2.72	$ 1.48	$ 1.15	$ 0.78	$ 14.47	$ 6.13	$ 3.62
Home Sales [Member]
Revenues	$ 1,151,564	$ 917,337	$ 1,004,789	$ 959,279	$ 946,803	$ 760,239	$ 747,415	$ 572,710	$ 4,032,969	$ 3,027,167	$ 2,481,465
Gross margin from home sales revenues	$ 298,704	$ 235,325	$ 240,121	$ 202,772	$ 197,216	$ 132,875	$ 126,760	$ 102,183