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Schedule II - Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2017
Valuation and Qualifying Accounts [Abstract] |
Schedule II - Valuation and Qualifying Accounts | SCHEDULE II—VALUATION AND QUALIFYING ACCOUNTS Years Ended December 31, 2017, 2016, and 2015 (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, 2017 |  | $33 |  |  | — |  |  | (10 | ) |  |  | $23 |
Year ended December 31, 2016 | 42 |  |  | — |  |  | (9 | ) |  | 33 |
Year ended December 31, 2015 | 42 |  |  | — |  |  | — |  |  | 42 |
Deferred tax asset valuation allowance: |  |  |  |  |  |  |
Year ended December 31, 2017 |  | $21,861 |  |  |  | $13,028 |  | (a) | — |  |  |  | $34,889 |
Year ended December 31, 2016 | 18,248 |  |  | 3,613 |  | (a) | — |  |  | 21,861 |
Year ended December 31, 2015 | 13,644 |  |  | 4,604 |  | (b) | — |  |  | 18,248 |
(a) | The 2017 and 2016 increase is comprised of valuation allowance against the TRS deferred tax assets.
(b) | The 2015 increase is comprised of valuation allowance against the TRS deferred tax assets and the CBPC provision to return adjustment.

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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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