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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS | 12 Months Ended
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Dec. 31, 2020
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] |
SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS | SCHEDULE II—VALUATION AND QUALIFYING ACCOUNTS Years Ended December 31, 2020, 2019, and 2018 (In Thousands)
Description | Balance at Beginning of Year |  | Additions Charged to Cost and Expenses |  | Deductions |  | Balance at End of Year
Allowance for doubtful accounts: |  |  |  |  |  |  |
Year ended December 31, 2020 | $24 |  |  | $1 |  |  | — |  |  | $25 |
Year ended December 31, 2019 | 8 |  |  | 16 |  |  | — |  |  | 24 |
Year ended December 31, 2018 | 23 |  |  | — |  |  | (15) |  |  | 8 |
Deferred tax asset valuation allowance: |  |  |  |  |  |  |
Year ended December 31, 2020 | $39,320 |  |  | $6,695 |  | (a) | — |  |  | $46,015 |
Year ended December 31, 2019 | 38,839 |  |  | 481 |  | (a) | — |  |  | 39,320 |
Year ended December 31, 2018 | 34,889 |  |  | 3,950 |  | (a) | — |  |  | 38,839 |
(a)The 2020, 2019 and 2018 increase is comprised of valuation allowance against the TRS deferred tax assets.

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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=120395691&loc=d3e24092-122690 + Details
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- References No definition available. + Details
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