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Commitments and Contingencies Legal (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2017 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Legal Liabilities Disclosure [Abstract] |  |  |  |  |  |  |
Product Liability Accrual, Period Expense |  |  |  |  |  |  | $ 500
Standard and Extended Product Warranty Accrual, Period Increase (Decrease) | $ 8,500 | $ 14,500 | $ 2,800 | $ 2,200 | $ 8,500 | $ 19,409 | $ 0
Estimated Repair Costs for Affected Homes |  |  |  |  | 9,100 |  |
Amount Reserved for Legal Expenses |  |  |  |  | $ 400 | $ 300 |

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- Definition Estimated Repair Costs for Affected Homes + References No definition available. + Details
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- Definition Legal Liabilities Disclosure [Abstract] + References No definition available. + Details
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- Definition The amount of loss reported during the period pertaining to product liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349 + Details
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- Definition Amount of increase (decrease) in the standard and extended product warranty liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249 + Details
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