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Fair Value Measurements Assets and Liabilities Measured on a Non-Recurring Basis (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Valuation adjustments to investments in joint venture arrangements | $ 0 | $ 0 | $ 0
Fair Value, Significant Unobservable Inputs, Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Adjusted basis of inventory | 3,823 | 12,921 | 11,885
Total losses | 7,681 | 3,992 | 3,638
Initial basis of inventory | $ 11,504 | $ 16,913 | $ 15,523

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- Definition The fair value of long lived real estate assets that are held by the entity and are expected to provide future economic benefit, that were impaired during the reporting period. + References No definition available. + Details
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- Definition The charge against earnings resulting from the aggregate write down of land, terminated options/purchase contracts and related pre acquisition costs, and real estate from their carrying value to their fair value. + References No definition available. + Details
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- Definition Losses recorded relating the entity's investment in unconsolidated entities, if its investment in the unconsolidated entity, or a portion thereof, is deemed to be other than temporary impaired. + References No definition available. + Details
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- Definition 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. + References No definition available. + Details
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