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Summary of Significant Accounting Policies Variable interest entities and unconsolidated joint ventures (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Variable Interest Entity [Line Items] |  |  |
Increase (decrease) in investments in joint venture arrangements | $ (7,491) |  |
Distribution of single-family lots from joint venture arrangements | 16,600 | $ 28,130 | $ 8,236
Investment in joint venture arrangements | (12,088) | (21,746) | $ (18,162)
Investment in joint venture arrangements | $ 20,525 | $ 28,016 |
Minimum [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Discount Rate Used in Determining Fair Value of land and lots | 13.00% | 13.00% |
Equity Method Investment, Ownership Percentage | 25.00% | 25.00% |
Maximum [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Discount Rate Used in Determining Fair Value of land and lots | 16.00% | 16.00% |
Equity Method Investment, Ownership Percentage | 97.00% | 74.00% |

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