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Equity (Tables) | 12 Months Ended
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Dec. 31, 2021
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, 2018 | ​ | $ | (21,814) | ​ | $ | (6,210) | ​ | $ | — | ​ | $ | (28,024)
Gains arising during period | ​ |  | 693 | ​ |  | — | ​ |  | 3,539 | ​ |  | 4,232
Amounts reclassified from accumulated other comprehensive loss | ​ |  | 97 | ​ |  | 333 | ​ |  | (1,905) | ​ |  | (1,475)
Income tax expense | ​ |  | (185) | ​ |  | — | ​ |  | — | ​ |  | (185)
Net other comprehensive income | ​ |  | 605 | ​ |  | 333 | ​ |  | 1,634 | ​ |  | 2,572
Transition adjustment related to adoption of ASU 2018-02 | ​ | ​ | (2,707) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (2,707)
Balance, December 31, 2019 | ​ | $ | (23,916) | ​ | $ | (5,877) | ​ | $ | 1,634 | ​ | $ | (28,159)
Losses arising during period | ​ |  | (2,901) | ​ |  | — | ​ |  | (39,958) | ​ |  | (42,859)
Amounts reclassified from accumulated other comprehensive loss | ​ |  | 194 | ​ |  | 210 | ​ |  | 10,505 | ​ |  | 10,909
Net other comprehensive income (loss) | ​ |  | (2,707) | ​ |  | 210 | ​ |  | (29,453) | ​ |  | (31,950)
Transition adjustment related to adoption of ASU 2016-13 | ​ | ​ | — | ​ | ​ | 2,158 | ​ | ​ | — | ​ | ​ | 2,158
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)

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