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SCHEDULE II —VALUATION AND QUALIFYING ACCOUNTS (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) item
VALUATION AND QUALIFYING ACCOUNTS |  |  |
Balance at Beginning of Year | $ 17,255 | $ 40,670 | $ 14,120
Additions Charged to Costs and Expenses | 5,044 |  | 26,564
Deductions |  | (23,415) | (14)
Balance at End of Year | 22,299 | 17,255 | $ 40,670
Number of seats on aircraft | item |  |  | 50
Allowance for inventory obsolescence |  |  |
VALUATION AND QUALIFYING ACCOUNTS |  |  |
Balance at Beginning of Year | 17,098 | 40,497 | $ 13,933
Additions Charged to Costs and Expenses | 5,043 |  | 26,564
Deductions |  | (23,399) |
Balance at End of Year | 22,141 | 17,098 | 40,497
Allowance for doubtful accounts receivable |  |  |
VALUATION AND QUALIFYING ACCOUNTS |  |  |
Balance at Beginning of Year | 157 | 173 | 187
Additions Charged to Costs and Expenses | 1 |  |
Deductions |  | (16) | (14)
Balance at End of Year | $ 158 | $ 157 | $ 173

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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 increase in valuation and qualifying accounts and reserves from charge to cost and expense. + 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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