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Item 15 (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
SEC Schedule, 12-09, Allowance, Credit Loss [Member] |  |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |
Allowances for Doubtful Accounts | $ 0 | $ 46 | $ 73 | $ 87
SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Cost and Expense | 0 | 0 | 133 |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Other Account | 0 | 0 | 27 |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction | (46) | (27) | (174) |
SEC Schedule, 12-09, Reserve, Warranty [Member] |  |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |
Allowances for Doubtful Accounts | 553 | 519 | 941 | 860
SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Cost and Expense | 74 | (414) | 492 |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Other Account | 0 | 0 | 122 |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction | (40) | (8) | (533) |
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member] |  |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |
Allowances for Doubtful Accounts | 77,957 | 79,196 | 84,560 | $ 100,284
SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Cost and Expense | (1,239) | (5,761) | (50,881) |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Other Account | 0 | 397 | 35,157 |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction | $ 0 | $ 0 | $ 0 |

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- Definition Amount of decrease in valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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