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Investment in Joint Venture Arrangements (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Schedule of Equity Method Investments [Line Items] |  |  |
Increase (decrease) in Investments Joint Venture Arrangements | $ (6,700) |  |
Investment in joint venture arrangements | 13,753 |  | $ 20,525
Distribution of single-family lots from joint venture arrangements | 10,641 | $ 9,995 |
Cash contributions to joint venture arrangements | $ 4,321 | $ 5,807 |
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%

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