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SCHEDULE II -VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
VALUATION AND QUALIFYING ACCOUNTS |  |  |
Balance at Beginning of Year | $ 22,299 | $ 17,255 | $ 40,670
Additions Charged to Costs and Expenses |  | 5,044 |
Deductions | (6,391) |  | (23,415)
Balance at End of Year | 15,908 | 22,299 | 17,255
Allowance for inventory obsolescence |  |  |
VALUATION AND QUALIFYING ACCOUNTS |  |  |
Balance at Beginning of Year | 22,141 | 17,098 | 40,497
Additions Charged to Costs and Expenses |  | 5,043 |
Deductions | (6,251) |  | (23,399)
Balance at End of Year | 15,890 | 22,141 | 17,098
Allowance for doubtful accounts receivable |  |  |
VALUATION AND QUALIFYING ACCOUNTS |  |  |
Balance at Beginning of Year | 158 | 157 | 173
Additions Charged to Costs and Expenses |  | 1 |
Deductions | (140) |  | (16)
Balance at End of Year | $ 18 | $ 158 | $ 157

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- Definition Amount of 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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- 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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