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Accumulated Other Comprehensive Loss (Tables) | 6 Months Ended
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Jun. 30, 2023
Equity |
Summary of Changes in Accumulated Other Comprehensive Loss by Component | ​ Changes in accumulated other comprehensive loss by component for the six months ended June 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 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1,467 | ​ | ​ | 1,467
Amounts reclassified from accumulated other comprehensive loss | ​ | ​ | (131) | ​ |  | 104 | ​ |  | (10,156) | ​ |  | (10,183)
Net other comprehensive income (loss) | ​ |  | (131) | ​ |  | 104 | ​ |  | (8,689) | ​ |  | (8,716)
Balance, June 30, 2023 | ​ | $ | (18,152) | ​ | $ | (2,983) | ​ | $ | 1,496 | ​ | $ | (19,639)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | 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) | ​ | ​ | — | ​ | ​ | 8,189 | ​ | ​ | 1,752
Amounts reclassified from accumulated other comprehensive loss | ​ |  | 707 | ​ |  | 105 | ​ |  | 6,124 | ​ |  | 6,936
Net other comprehensive income (loss) | ​ |  | (5,730) | ​ |  | 105 | ​ |  | 14,313 | ​ |  | 8,688
Balance, June 30, 2022 | ​ | $ | (22,149) | ​ | $ | (3,193) | ​ | $ | 4,950 | ​ | $ | (20,392)

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