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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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- Definition

Remaining Purchase Price Of All Land Option Agreements

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Carrying amount of an option or options to acquire real property.

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