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Schedule II - Valuation and Qualifying Account (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Allowance for doubtful accounts |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of period | $ 4,777 | $ 14,337 | $ 2,528
Additions / Charged to Expense | 348 | 346 | 10,374
Deductions | (1,200) | (9,725) | (761)
Other | 0 | (181) | 2,196
Balance at end of period | 3,925 | 4,777 | 14,337
Allowance for excess and obsolete inventory |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of period | 21,584 | 4,626 | 2,200
Additions / Charged to Expense | 1,800 | 19,727 | 1,762
Deductions | (760) | (2,769) | (1,855)
Other | 0 | 0 | 2,519
Balance at end of period | 22,624 | 21,584 | 4,626
Allowance for deferred tax assets |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of period | 60,524 | 5,442 | 2,798
Additions / Charged to Expense | 24,448 | 56,207 | 2,644
Deductions | 0 | (1,125) | 0
Other | 0 | 0 | 0
Balance at end of period | $ 84,972 | $ 60,524 | $ 5,442

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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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