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Commitments and Contingencies Warranty Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Commitments and Contingencies Disclosure [Abstract] |  |  |  |
Total warranty expense (benefit) | $ 1,528 | $ (3,148) | $ 12,291 | $ (5,318)
Unusual or Infrequent Item, or Both, Insurance Proceeds |  | $ 8,000 |  | $ 8,000

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- Definition Product Warranty Expense (Benefit) + References No definition available. + Details
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Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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- Definition Amount of insurance proceeds for an event or transaction that is unusual in nature or infrequent in occurrence, or both. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=114868883&loc=SL114871943-224233 + Details
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