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Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2020
Equity [Abstract] |
Summary of Changes in Accumulated Other Comprehensive Income (Loss) | The changes in accumulated other comprehensive income (loss) are as follows:
| Gains and (Losses) on Cash Flow Hedges |  | Defined Benefit Pension Plan |  | Total Accumulated Other Comprehensive Income (Loss)
| (In thousands)
Balance at December 31, 2017 | $ | 1,750 |  |  | $ | (443) |  |  | $ | 1,307 |
Other comprehensive income before reclassifications (1) | 1,517 |  |  | 1,642 |  |  | 3,159 |
Amounts reclassified out of accumulated other comprehensive income (loss) (2) | (233) |  |  | — |  |  | (233) |
Net current-period other comprehensive income | 1,284 |  |  | 1,642 |  |  | 2,926 |
Balance at December 31, 2018 | $ | 3,034 |  |  | $ | 1,199 |  |  | $ | 4,233 |
Other comprehensive income (loss) before reclassifications (3) | (1,646) |  |  | (1,935) |  |  | (3,581) |
Amounts reclassified out of accumulated other comprehensive income (loss) (4) | (2,714) |  |  | — |  |  | (2,714) |
Net current-period other comprehensive income (loss) | (4,360) |  |  | (1,935) |  |  | (6,295) |
Balance at December 31, 2019 | $ | (1,326) |  |  | $ | (736) |  |  | $ | (2,062) |
Other comprehensive income (loss) before reclassifications (5) | 1,140 |  |  | (1,336) |  |  | (196) |
Amounts reclassified out of accumulated other comprehensive income (loss) (6) | (1,358) |  |  | — |  |  | (1,358) |
Net current-period other comprehensive income (loss) | (218) |  |  | (1,336) |  |  | (1,554) |
Balance at December 31, 2020 | $ | (1,544) |  |  | $ | (2,072) |  |  | $ | (3,616) |
(1)Net of tax expense of $548 related to gains on cash flow hedges and tax expense of $726 related to the defined benefit pension plan. (2)Net of tax benefit of $88 related to gains on cash flow hedges. (3)Net of tax benefit of $836 related to gains on cash flow hedges and tax benefit of $734 related to the defined benefit pension plan. (4)Net of tax benefit of $1,108 related to gains on cash flow hedges. (5)Net of tax expense of $337 related to cash flow hedges and tax benefit of $507 related to the defined benefit pension plan. (6)Net of tax benefit of $555 related to cash flow hedges.

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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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