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Accumulated Other Comprehensive Loss (Tables) | 9 Months Ended
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Sep. 30, 2019
Accumulated Other Comprehensive Loss |
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, 2019 and 2018 consisted of the following (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)
Losses arising during period | ​ | ​ | (5,164) | ​ | ​ | — | ​ | ​ | (3,789) | ​ | ​ | (8,953)
Amounts reclassified from accumulated other comprehensive loss | ​ | ​ | 1,635 | ​ |  | 249 | ​ |  | (1,197) | ​ |  | 687
Income tax benefit | ​ | ​ | 880 | ​ |  | — | ​ |  | — | ​ |  | 880
Net other comprehensive income (loss) | ​ |  | (2,649) | ​ |  | 249 | ​ |  | (4,986) | ​ |  | (7,386)
Transition adjustment related to adoption of ASU 2018-02 (see Note 1) | ​ | ​ | (2,707) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (2,707)
Balance, September 30, 2019 | ​ | $ | (27,170) | ​ | $ | (5,961) | ​ | $ | (4,986) | ​ | $ | (38,117)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Other-Than- | ​ | ​ | ​ | ​ | ​
​ | ​ | Minimum | ​ | Temporary | ​ | ​ | ​ | ​ | ​
​ | ​ | Pension | ​ | Impairment of | ​ | Interest Rate | ​ | ​ | ​
​ |  | Liability |  | Investment |  | Derivatives |  | Total
Balance, December 31, 2017 | ​ | $ | (20,149) | ​ | $ | (6,543) | ​ | $ | — | ​ | $ | (26,692)
Gains arising during period | ​ | ​ | 3,439 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 3,439
Amounts reclassified from accumulated other comprehensive loss | ​ |  | 990 | ​ |  | 249 | ​ |  | — | ​ |  | 1,239
Income tax expense | ​ |  | (1,077) | ​ |  | — | ​ |  | — | ​ |  | (1,077)
Net other comprehensive income | ​ |  | 3,352 | ​ |  | 249 | ​ |  | — | ​ |  | 3,601
Balance, September 30, 2018 | ​ | $ | (16,797) | ​ | $ | (6,294) | ​ | $ | — | ​ | $ | (23,091)

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 + Details
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