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BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) region state community | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Organization and Presentation [Line Items] |  |  |
Entity operations in number of regions | region | 3 |  |
Number of states in regions | state | 9 |  |
Number of communities in which homes are sold | community | 195 |  |
Deposits on real estate under option or contract | $ 59,534 | $ 50,901 |
Depreciation expense | 18,900 | 17,300 | $ 16,300
Debt issuance costs related to credit facility, net | 4,700 | 3,300 |
Advertising expense | 10,500 | 14,600 | 15,400
Contribution to the 401(K) Retirement Plan | 4,700 | 4,100 | $ 3,700
Increase (decrease) to warranty reserve balance | 0 | 0 |
Right of use asset | 21,624 | 26,332 |
Present value of lease liabilities | $ 28,254 | 34,231 |
Non-Structural Items [Member] |  |  |
Organization and Presentation [Line Items] |  |  |
Warranty period following home closings | 2 years |  |
Cash and Cash Equivalents [Member] |  |  |
Organization and Presentation [Line Items] |  |  |
Amounts in transit from title companies for home closings | $ 61,300 | $ 54,500 |
Minimum [Member] |  |  |
Organization and Presentation [Line Items] |  |  |
Base price per house for sale range | $ 191 |  |
Community life cycle range | 3 years |  |
Property and equipment useful life | 3 years |  |
Maximum [Member] |  |  |
Organization and Presentation [Line Items] |  |  |
Base price per house for sale range | $ 921 |  |
Community life cycle range | 5 years |  |
Property and equipment useful life | 7 years |  |
Maximum [Member] | Structural [Member] |  |  |
Organization and Presentation [Line Items] |  |  |
Warranty period following home closings | 10 years |  |

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