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Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2018
Valuation And Qualifying Accounts [Abstract] |
Valuation and Qualifying Accounts | Schedule II - Valuation and Qualifying Accounts Years ended December 31, 2018, 2017, and 2016 (In Thousands)
Description (1) |  | Balance at Beginning of Year |  |  | Additions- Charges to (Recovery of) Costs and Expenses |  |  | Deductions- Write- offs/Costs Incurred |  |  | Balance at End of Year |
Accounts receivable - allowance for doubtful accounts: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2018 |  | $ | 303 |  |  | $ | 124 |  |  | $ | 76 |  |  | $ | 351 |
2017 |  | $ | 357 |  |  | $ | (54 | ) |  | $ | — |  |  | $ | 303 |
2016 |  | $ | 525 |  |  | $ | 80 |  |  | $ | 248 |  |  | $ | 357 |
Supplies-reserve for slow-moving items: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2018 |  | $ | 15 |  |  | $ | — |  |  | $ | — |  |  | $ | 15 |
2017 |  | $ | 15 |  |  | $ | — |  |  | $ | — |  |  | $ | 15 |
2016 |  | $ | 928 |  |  | $ | — |  |  | $ | 913 |  |  | $ | 15 |
Notes receivable - allowance for doubtful accounts: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2016 |  | $ | 970 |  |  | $ | — |  |  | $ | 970 |  |  | $ | — |
Deferred tax assets - valuation allowance: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2018 |  | $ | 26,920 |  |  | $ | 21,042 |  |  | $ | 2,336 |  |  | $ | 45,626 |
2017 |  | $ | 13,128 |  |  | $ | 13,792 |  |  | $ | — |  |  | $ | 26,920 |
2016 |  | $ | 1,242 |  |  | $ | 11,886 |  |  | $ | — |  |  | $ | 13,128 |
(1) | Deducted in the consolidated balance sheet from the related assets to which the reserve applies.
Other valuation and qualifying accounts are detailed in our notes to consolidated financial statements.

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- Definition The entire disclosure for valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 09 Reference 2: 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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- References No definition available. + Details
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