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Accumulated Other Comprehensive Loss (Tables) | 9 Months Ended
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Sep. 30, 2023
Equity |
Summary of Changes in Accumulated Other Comprehensive Loss by Component | ​ Changes in accumulated other comprehensive loss by component for the nine months ended September 30, 2023 and 2022 consisted of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Other-Than- | ​ | ​ | ​ | ​ | ​
​ | ​ | Minimum | ​ | Temporary | ​ | ​ | ​ | ​ | ​
​ | ​ | Pension | ​ | Impairment of | ​ | Interest Rate | ​ | ​ | ​
​ |  | Liability |  | Investment |  | Derivatives |  | Total
Balance, December 31, 2022 | ​ | $ | (18,021) | ​ | $ | (3,087) | ​ | $ | 10,185 | ​ | $ | (10,923)
Gains arising during period | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 3,029 | ​ | ​ | 3,029
Amounts reclassified from accumulated other comprehensive loss | ​ | ​ | (220) | ​ |  | 156 | ​ |  | (11,734) | ​ |  | (11,798)
Net other comprehensive income (loss) | ​ |  | (220) | ​ |  | 156 | ​ |  | (8,705) | ​ |  | (8,769)
Balance, September 30, 2023 | ​ | $ | (18,241) | ​ | $ | (2,931) | ​ | $ | 1,480 | ​ | $ | (19,692)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Other-Than- | ​ | ​ | ​ | ​ | ​
​ | ​ | Minimum | ​ | Temporary | ​ | ​ | ​ | ​ | ​
​ | ​ | Pension | ​ | Impairment of | ​ | Interest Rate | ​ | ​ | ​
​ |  | Liability |  | Investment |  | Derivatives |  | Total
Balance, December 31, 2021 | ​ | $ | (16,419) | ​ | $ | (3,298) | ​ | $ | (9,363) | ​ | $ | (29,080)
Gains (losses) arising during period | ​ | ​ | (6,437) | ​ | ​ | — | ​ | ​ | 15,642 | ​ | ​ | 9,205
Amounts reclassified from accumulated other comprehensive loss | ​ |  | 1,416 | ​ |  | 158 | ​ |  | 6,375 | ​ |  | 7,949
Net other comprehensive income (loss) | ​ |  | (5,021) | ​ |  | 158 | ​ |  | 22,017 | ​ |  | 17,154
Balance, September 30, 2022 | ​ | $ | (21,440) | ​ | $ | (3,140) | ​ | $ | 12,654 | ​ | $ | (11,926)
​

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