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Inventory (Summary of Interests in Land Option Agreements) (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Variable Interest Entity [Line Items] |  |
Deposits and Pre-acquisition Costs | $ 290,356 | $ 299,437
Remaining Purchase Price | 3,686,733 | 3,221,962
Land options with VIEs |  |
Variable Interest Entity [Line Items] |  |
Deposits and Pre-acquisition Costs | 115,420 | 123,775
Remaining Purchase Price | 1,497,721 | 1,466,585
Other land options |  |
Variable Interest Entity [Line Items] |  |
Deposits and Pre-acquisition Costs | 174,936 | 175,662
Remaining Purchase Price | $ 2,189,012 | $ 1,755,377

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