Revenue Recognition Product Warranty Liability (Tables) |
6 Months Ended | ||||||||||||||||||||||||||||||
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Jun. 30, 2020 | |||||||||||||||||||||||||||||||
| Product Warranties Disclosures [Abstract] | |||||||||||||||||||||||||||||||
| Schedule of Product Warranty Liability [Table Text Block] | The changes in deferred service-type warranty revenue are as follows (in thousands):
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