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Commitments and Contingencies Legal Liabilities (Details) - USD ($) $ in Millions | Mar. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Other Liabilities Disclosure [Abstract] |  |  |
Product Liability Accrual, Component Amount |  | $ 19.4 | $ 0.5
Estimated Repair Costs for Affected Homes | $ 8.8 |  |
Amount Reserved for Legal Expenses | $ 0.3 | $ 0.3 |

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- Definition Amount reserved for legal expenses + References No definition available. + Details
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- Definition Estimated Repair Costs for Affected Homes + References No definition available. + Details
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Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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- Definition Recorded amount of the accrual for a material component of a product liability contingency. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.Y.Q2) -URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 + Details
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