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Schedule II - Valuation and qualifying accounts | 12 Months Ended
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Dec. 31, 2018
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] |
Schedule II - Valuation and qualifying accounts | (2) Financial Statement Schedule. — Schedule II - Valuation and qualifying accounts Years Ended December 31, 2018, 2017 and 2016 (In thousands)
Description |  | Balance at Beginning of Year |  | Additions Charged to Costs and Expenses (a) |  | Deduction (b) |  | Balance at End of Year
ALLOWANCE FOR UNCOLLECTIBLE ACCOUNTS: |  |  |  |  |  |
2016 |  | (1,297 | ) |  | (612 | ) |  | 322 |  |  | (1,587 | )
2017 |  | (1,587 | ) |  | (1,012 | ) |  | 830 |  |  | (1,769 | )
2018 |  | (1,769 | ) |  | (1,055 | ) |  | 469 |  |  | (2,355 | )
(a) We record a bad debt provision based upon historical experience and a review of individual customer balances. (b) When an individual customer balance becomes impaired and is deemed uncollectible, a deduction is made against the allowance for uncollectible accounts. Years Ended December 31, 2018, 2017 and 2016 (In thousands)
Description |  | Balance at Beginning of Year |  | Additions Charged to Costs and Expenses (c) |  | Deduction |  | Balance at End of Year
TAX VALUATION ALLOWANCE: |  |  |  |  |  |  |  |  |  |  |  |
2016 |  | (1,981 | ) |  | (1,805 | ) |  | — |  |  | (3,786 | )
2017 |  | (3,786 | ) |  | (636 | ) |  | — |  |  | (4,422 | )
2018 |  | (4,422 | ) |  | (567 | ) |  | — |  |  | (4,989 | )
(c) We record a valuation allowance against a deferred tax asset when it is determined that it is more likely than not that the deferred tax asset will not be realized.

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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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