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Schedule II - Valuation and qualifying accounts | 12 Months Ended
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Dec. 31, 2019
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, 2019, 2018 and 2017 (In thousands)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Balance at | ​ | Additions Charged to | ​ | ​ | ​ | Balance at
Description |  | Beginning of Year |  | Costs and Expenses (a) |  | Deduction (b) |  | End of Year
ALLOWANCE FOR UNCOLLECTIBLE ACCOUNTS: |  |  |  |  |  |  |  |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
2017 |  | (1,587) |  | (1,012) |  | 830 |  | (1,769)
2018 |  | (1,769) |  | (1,055) |  | 469 |  | (2,355)
2019 |  | (2,355) |  | (1,163) |  | 410 |  | (3,108)
| (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, 2019, 2018 and 2017 (In thousands)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Balance at | ​ | Additions Charged to | ​ | ​ | ​ | Balance at
Description |  | Beginning of Year |  | Costs and Expenses (c) |  | Deduction |  | End of Year
TAX VALUATION ALLOWANCE: |  |  |  |  |  |  |  |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
2017 |  | (3,786) |  | (636) |  | — |  | (4,422)
2018 |  | (4,422) |  | (567) |  | — |  | (4,989)
2019 |  | (4,989) |  | — |  | 345 |  | (4,644)
| (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.
(b) | Exhibits:

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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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