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Accumulated Other Comprehensive Loss (Tables) | 9 Months Ended
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Sep. 30, 2020
Equity |
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, 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 | ​ | ​ | (11,167) | ​ | ​ | — | ​ | ​ | (39,965) | ​ | ​ | (51,132)
Amounts reclassified from accumulated other comprehensive loss | ​ | ​ | 1,444 | ​ |  | 158 | ​ |  | 6,479 | ​ |  | 8,081
Net other comprehensive income (loss) | ​ |  | (9,723) | ​ |  | 158 | ​ |  | (33,486) | ​ |  | (43,051)
Transition adjustment related to adoption of ASU 2016-13 (see Note 1) | ​ | ​ | — | ​ | ​ | 2,158 | ​ | ​ | — | ​ | ​ | 2,158
Balance, September 30, 2020 | ​ | $ | (33,639) | ​ | $ | (3,561) | ​ | $ | (31,852) | ​ | $ | (69,052)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | 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 | ​ | ​ | (2,707) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (2,707)
Balance, September 30, 2019 | ​ | $ | (27,170) | ​ | $ | (5,961) | ​ | $ | (4,986) | ​ | $ | (38,117)

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 2: 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=121641772&loc=SL7669686-108580 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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