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Business Segments Business Segments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Segment Reporting Information [Line Items]      
Revenue $ 4,033,502 $ 4,131,393 $ 3,745,887
Operating income (loss): 587,222 637,451 518,296
Interest Expense   2,250 2,156
Interest Income, net of Interest Expense (20,022)    
Other Income (33) (6) (2,046)
Loss on early extinguishment of debt 0 0 9,072
Income before income taxes 607,277 635,207 509,114
Depreciation and amortization: 15,791 17,174 16,915
Northern Homebuilding [Member]      
Segment Reporting Information [Line Items]      
Revenue 1,523,943 1,714,236 1,595,746
Operating income (loss): 176,320 217,499 211,958
Interest Expense     76
Interest Income, net of Interest Expense (186) (469)  
Depreciation and amortization: 3,673 3,308 3,407
Southern Homebuilding [Member]      
Segment Reporting Information [Line Items]      
Revenue 2,415,730 2,330,962 2,048,113
Operating income (loss): 440,168 451,874 312,661
Interest Income, net of Interest Expense (1,703) (1,447) (464)
Depreciation and amortization: 2,965 2,790 3,644
Financial Service      
Segment Reporting Information [Line Items]      
Revenue 93,829 86,195 102,028
Operating income (loss): 48,714 44,382 62,291
Interest Expense 10,360 5,122 3,912
Depreciation and amortization: 810 2,178 2,227
Corporate and Other [Member]      
Segment Reporting Information [Line Items]      
Less: Corporate selling, general and administrative expenses (77,980) (76,304) (68,614)
Interest and Other Income (28,493) (956) (1,368)
Depreciation and amortization: $ 8,343 $ 8,898 $ 7,637