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Equity (Tables) | 12 Months Ended
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Dec. 31, 2023
Equity |
Summary of Changes in Accumulated Other Comprehensive Loss by Component | Changes in accumulated other comprehensive loss by component consisted of the following (amounts in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | Other-Than- |  | ​ |  | ​ | ​
​ | ​ | Minimum | ​ | Temporary | ​ | ​ | ​ | ​ | ​
​ | ​ | Pension | ​ | Impairment of | ​ | Interest Rate | ​ | ​ | ​
​ | ​ | Liability | ​ | Investment | ​ | Derivatives | ​ | Total
Balance, December 31, 2020 | ​ | $ | (26,623) | ​ | $ | (3,509) | ​ | $ | (27,819) | ​ | $ | (57,951)
Gains arising during period | ​ |  | 10,314 | ​ |  | — | ​ |  | 1,955 | ​ |  | 12,269
Amounts reclassified from accumulated other comprehensive loss | ​ |  | (110) | ​ |  | 211 | ​ |  | 16,501 | ​ |  | 16,602
Net other comprehensive income | ​ |  | 10,204 | ​ |  | 211 | ​ |  | 18,456 | ​ |  | 28,871
Balance, December 31, 2021 | ​ | $ | (16,419) | ​ | $ | (3,298) | ​ | $ | (9,363) | ​ | $ | (29,080)
Gains (losses) arising during period | ​ |  | (1,428) | ​ |  | — | ​ |  | 16,007 | ​ |  | 14,579
Amounts reclassified from accumulated other comprehensive loss | ​ |  | (174) | ​ |  | 211 | ​ |  | 3,541 | ​ |  | 3,578
Net other comprehensive income (loss) | ​ |  | (1,602) | ​ |  | 211 | ​ |  | 19,548 | ​ |  | 18,157
Balance, December 31, 2022 | ​ | $ | (18,021) | ​ | $ | (3,087) | ​ | $ | 10,185 | ​ | $ | (10,923)
Gains arising during period | ​ |  | 4,428 | ​ |  | — | ​ |  | 670 | ​ |  | 5,098
Amounts reclassified from accumulated other comprehensive loss | ​ |  | (308) | ​ | ​ | 209 | ​ | ​ | (12,177) | ​ |  | (12,276)
Income tax expense | ​ |  | (1,286) | ​ |  | — | ​ |  | — | ​ |  | (1,286)
Net other comprehensive income (loss) | ​ |  | 2,834 | ​ |  | 209 | ​ |  | (11,507) | ​ |  | (8,464)
Balance, December 31, 2023 | ​ | $ | (15,187) | ​ | $ | (2,878) | ​ | $ | (1,322) | ​ | $ | (19,387)
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