Commitments and Contingencies Legal Liabilities (Details) $ in Millions	Mar. 31, 2016 USD ($) homes	Dec. 31, 2015 USD ($)
Other Liabilities Disclosure [Abstract]
Product Liability Accrual, Component Amount	$ 2.2	$ 0.5
Estimated Repair Costs for Affected Homes	$ 1.8
Number of Affected Homes \| homes	138
Amount Reserved for Legal Expenses	$ 0.4	$ 0.6

Recorded amount of the accrual for a material component of a product liability contingency.

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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant