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Schedule II - Valuation and qualifying accounts | 12 Months Ended
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Dec. 31, 2023
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] |
Schedule II - Valuation and qualifying accounts | (2) Financial Statement Schedules.
| — | Schedule II - Valuation and qualifying accounts
Years Ended December 31, 2023, 2022 and 2021 (In thousands)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | Balance at | ​ | ​ | Additions Charged to | ​ | ​ | ​ | ​ | ​ | Balance at
Allowance for Credit Losses: |  | ​ | Beginning of Year |  | ​ | Costs and Expenses (a) | ​ | ​ | Deduction (b) |  | ​ | End of Year
2021 |  | $ | (5,313) |  | $ | (2,678) | ​ | $ | 1,224 |  | $ | (6,767)
2022 |  | $ | (6,767) |  | $ | (1,858) | ​ | $ | 202 |  | $ | (8,423)
2023 |  | $ | (8,423) |  | $ | (1,772) | ​ | $ | 1,172 |  | $ | (9,023)
| (a) | We record a provision for credit losses based upon historical bad debt experience, current economic conditions, expectations of future economic conditions, and management’s evaluation of our ability to collect individual outstanding balances.
| (b) | When an individual customer balance becomes impaired and is deemed uncollectible, a deduction is made against the allowance for credit losses.
​ Years Ended December 31, 2023, 2022 and 2021 (In thousands)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | Balance at | ​ | ​ | Additions Charged to | ​ | ​ | ​ | ​ | ​ | Balance at
Tax Valuation Allowance: |  | ​ | Beginning of Year |  | ​ | Costs and Expenses (a) |  | ​ | Deduction |  | ​ | End of Year
2021 |  | $ | (10,213) |  | $ | (573) |  | $ | - |  | $ | (10,786)
2022 |  | $ | (10,786) |  | $ | (2,741) |  | $ | - |  | $ | (13,527)
2023 |  | $ | (13,527) |  | $ | (213) |  | $ | - |  | $ | (13,740)
| (a) | 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 -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 09 -Publisher SEC Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480678/235-10-S99-4 + Details
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- References No definition available. + Details
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