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Inventory (Summary of Interests in Land Option Agreements) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Variable Interest Entity [Line Items] |  |
Deposits and Pre-acquisition Costs | $ 354,288 | $ 291,864
Remaining Purchase Price | 5,288,883 | 3,773,568
Land options with VIEs |  |
Variable Interest Entity [Line Items] |  |
Deposits and Pre-acquisition Costs | 141,168 | 126,900
Remaining Purchase Price | 2,163,429 | 1,586,551
Other land options |  |
Variable Interest Entity [Line Items] |  |
Deposits and Pre-acquisition Costs | 213,120 | 164,964
Remaining Purchase Price | $ 3,125,454 | $ 2,187,017

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