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SCHEDULE II—VALUATION AND QUALIFYING ACCOUNTS | 12 Months Ended
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Dec. 31, 2017
SCHEDULE II—VALUATION AND QUALIFYING ACCOUNTS |
SCHEDULE II—VALUATION AND QUALIFYING ACCOUNTS | SKYWEST, INC. AND SUBSIDIARIES SCHEDULE II—VALUATION AND QUALIFYING ACCOUNTS For the Years Ended December 31, 2017, 2016 and 2015 (Dollars in thousands)
|  |  |  |  | Additions |  |  |  |  |  |
|  | Balance at |  | Charged to |  |  |  |  |  |
|  | Beginning |  | Costs and |  |  |  | Balance at |
Description |  | of Year |  | Expenses |  | Deductions |  | End of Year |
Year ended December 31, 2017: |  |  |  |  |  |  |  |  |  |  |  |
Allowance for inventory obsolescence(1) |  | $ | 40,497 |  |  | — |  | (23,399) |  | $ | 17,098 |
Allowance for doubtful accounts receivable |  |  | 173 |  |  | — |  | (16) |  |  | 157 |
|  | $ | 40,670 |  |  | — |  | (23,415) |  | $ | 17,255 |
Year ended December 31, 2016: |  |  |  |  |  |  |  |  |  |  |  |
Allowance for inventory obsolescence(2) |  | $ | 13,933 |  |  | 26,564 |  | — |  | $ | 40,497 |
Allowance for doubtful accounts receivable |  |  | 187 |  |  | — |  | (14) |  |  | 173 |
|  | $ | 14,120 |  |  | 26,564 |  | (14) |  | $ | 40,670 |
Year ended December 31, 2015: |  |  |  |  |  |  |  |  |  |  |  |
Allowance for inventory obsolescence |  | $ | 11,588 |  |  | 2,345 |  | — |  | $ | 13,933 |
Allowance for doubtful accounts receivable |  |  | 326 |  |  | — |  | (139) |  |  | 187 |
|  | $ | 11,914 |  |  | 2,345 |  | (139) |  | $ | 14,120 |
| (1) |  | The deductions in 2017 related to the disposal of excess and obsolete inventory in 2017.
| (2) |  | The increase in the inventory obsolescence related to additional excess inventory identified as part of the impairment analysis of the 50-seat aircraft. See note 8, Special items, for additional detail on the impairment.

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- Definition The entire disclosure for any allowance and reserve accounts (their beginning and ending balances, as well as a reconciliation by type of activity during the period). Alternatively, disclosure of the required information may be within the footnotes to the financial statements or a supplemental schedule to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -URI http://asc.fasb.org/topic&trid=2122369 + Details
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