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Accumulated Other Comprehensive Loss (Tables) | 6 Months Ended
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Jun. 30, 2020
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, 2020 and 2019 consisted of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Other-Than- | ​ | ​ | ​ | ​ | ​
​ | ​ | Minimum | ​ | Temporary | ​ | ​ | ​ | ​ | ​
​ | ​ | Pension | ​ | Impairment of | ​ | Interest Rate | ​ | ​ | ​
​ |  | Liability |  | Investment |  | Derivatives |  | Total
Balance, December 31, 2019 | ​ | $ | (23,916) | ​ | $ | (5,877) | ​ | $ | 1,634 | ​ | $ | (28,159)
Losses arising during period | ​ | ​ | (1,106) | ​ | ​ | — | ​ | ​ | (40,148) | ​ | ​ | (41,254)
Amounts reclassified from accumulated other comprehensive loss | ​ | ​ | 33 | ​ |  | 105 | ​ |  | 2,490 | ​ |  | 2,628
Net other comprehensive income (loss) | ​ |  | (1,073) | ​ |  | 105 | ​ |  | (37,658) | ​ |  | (38,626)
Transition adjustment related to adoption of ASU 2016-13 (see Note 1) | ​ | ​ | — | ​ | ​ | 2,158 | ​ | ​ | — | ​ | ​ | 2,158
Balance, June 30, 2020 | ​ | $ | (24,989) | ​ | $ | (3,614) | ​ | $ | (36,024) | ​ | $ | (64,627)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Other-Than- | ​ | ​ | ​ | ​ | ​
​ | ​ | Minimum | ​ | Temporary | ​ | ​ | ​ | ​ | ​
​ | ​ | Pension | ​ | Impairment of | ​ | Interest Rate | ​ | ​ | ​
​ |  | Liability |  | Investment |  | Derivatives |  | Total
Balance, December 31, 2018 | ​ | $ | (21,814) | ​ | $ | (6,210) | ​ | $ | — | ​ | $ | (28,024)
Amounts reclassified from accumulated other comprehensive loss | ​ |  | 39 | ​ |  | 166 | ​ |  | — | ​ |  | 205
Income tax benefit | ​ |  | 2 | ​ |  | — | ​ |  | — | ​ |  | 2
Net other comprehensive income | ​ |  | 41 | ​ |  | 166 | ​ |  | — | ​ |  | 207
Transition adjustment related to adoption of ASU 2018-02 | ​ | ​ | (2,707) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (2,707)
Balance, June 30, 2019 | ​ | $ | (24,480) | ​ | $ | (6,044) | ​ | $ | — | ​ | $ | (30,524)

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