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Commitments and Contingencies Warranty Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Commitments and Contingencies Disclosure [Abstract] |  |  |  |
Total warranty expense | $ 6,187 | $ 5,901 | $ 7,966 | $ 10,763

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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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