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Accumulated Other Comprehensive Income (Tables) | 12 Months Ended
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Dec. 31, 2020
Equity [Abstract] |
Changes in Accumulated Other Comprehensive Income by Component, Net of Tax | Changes in accumulated other comprehensive income by component, net of tax, were as follows:
(In thousands) | Postretirement Benefits |  |
Balance at December 31, 2017 | $ | 2,077 |  |  |
Other comprehensive income before reclassifications | 2,461 |  |  |
Amounts reclassified from accumulated other comprehensive loss | (101) |  |  |
Net current-period other comprehensive income | 2,360 |  |  |
Balance at December 31, 2018 | $ | 4,437 |  |  |
Other comprehensive income before reclassifications | (2,530) |  |  |
Amounts reclassified from accumulated other comprehensive loss | (547) |  |  |
Net current-period other comprehensive income | (3,077) |  |  |
Balance at December 31, 2019 | $ | 1,360 |  |  |
Other comprehensive income before reclassifications | 1,634 |  |  |
Amounts reclassified from accumulated other comprehensive loss | (575) |  |  |
Net current-period other comprehensive income | 1,059 |  |  |
Balance at December 31, 2020 | $ | 2,419 |  |  |
Schedule of Amounts Reclassified from Accumulated Other Comprehensive Income into Consolidated Statement of Operations | Amounts reclassified from accumulated other comprehensive income into the Consolidated Statement of Operations were as follows:
| Year Ended December 31, |  | Affected Line Item in the Consolidated Statement of Operations
(In thousands) | 2020 |  | 2019 |  | 2018 |
Postretirement benefits |  |  |  |  |  |  |
Amortization of prior service cost | $ | 709 |  |  | $ | 709 |  |  | $ | 709 |  |  | General and administrative expense
Amortization of net (gain) loss | 36 |  |  | — |  |  | — |  |  | General and administrative expense
Total before tax | 745 |  |  | 709 |  |  | 709 |  |  | Income before income taxes
Income tax expense | (170) |  |  | (162) |  |  | (162) |  |  | Income tax expense
Cumulative effect of adoption of ASU 2018-02 reclassified to retained earnings | — |  |  | — |  |  | (446) |  |  | Retained earnings
Total reclassifications for the period | $ | 575 |  |  | $ | 547 |  |  | $ | 101 |  |  | Net income

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