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SCHEDULE II—VALUATION AND QUALIFYING ACCOUNTS (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2016 USD ($) item | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
VALUATION AND QUALIFYING ACCOUNTS |  |  |  |
Balance at Beginning of Year |  | $ 40,670 | $ 14,120 | $ 11,914
Additions Charged to Costs and Expenses |  |  | 26,564 | 2,345
Deductions |  | (23,415) | (14) | (139)
Balance at End of Year | $ 40,670 | 17,255 | 40,670 | 14,120
Number of seats on aircraft | item | 50 |  |  |
Allowance for inventory obsolescence |  |  |  |
VALUATION AND QUALIFYING ACCOUNTS |  |  |  |
Balance at Beginning of Year |  | 40,497 | 13,933 | 11,588
Additions Charged to Costs and Expenses |  |  | 26,564 | 2,345
Deductions |  | (23,399) |  |
Balance at End of Year | $ 40,497 | 17,098 | 40,497 | 13,933
Allowance for doubtful accounts receivable |  |  |  |
VALUATION AND QUALIFYING ACCOUNTS |  |  |  |
Balance at Beginning of Year |  | 173 | 187 | 326
Deductions |  | (16) | (14) | (139)
Balance at End of Year | $ 173 | $ 157 | $ 173 | $ 187

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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 the allowances and reserves, which consist of the valuation and qualifying accounts that are either netted against the cost of an asset or that reflect a liability established to represent expected future costs, from charges to costs and expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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