Investment in Joint Venture Arrangements (Details) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]
Increase (decrease) in Investments Joint Venture Arrangements	$ 4,100
Investment in joint venture arrangements	24,568		$ 20,525
Distribution of single-family lots from joint venture arrangements	16,036	$ 11,839
Investment in joint venture arrangements	$ 20,487	$ 8,439
Maximum [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	97.00%		97.00%
Minimum [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	25.00%		25.00%

Distribution of single-family lots from unconsolidated LLC's

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Increase in investment in LLCs and other joint agreements

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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The cash outflow associated with the acquisition of or advances to an entity that is related to it but not strictly controlled (for example, an unconsolidated subsidiary, affiliate, and joint venture or equity method investment) or the acquisition of an additional interest in a subsidiary (controlled entity).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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