Fair Value Measurements Assets and Liabilities Measured on a Non-Recurring Basis (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
---|---|---|---|---|
Sep. 30, 2018 |
Sep. 30, 2017 |
Sep. 30, 2018 |
Sep. 30, 2017 |
|
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||||
Inventory valuation adjustments and abandoned land transaction write-offs | $ 0 | $ 0 | $ 0 | $ 0 |
Assets Held-for-sale, Not Part of Disposal Group | 5,600 | 5,600 | ||
Equity Method Investment, Other than Temporary Impairment | 0 | 0 | 0 | 0 |
Impairment Charge on Reclassified Assets | $ 0 | $ 0 | $ 0 | $ 0 |