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Changes in Accumulated Other Comprehensive Loss by Component - Rollforward (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Changes to accumulated other comprehensive loss by component |  |
Balance at the beginning of the period | $ (2,814) | $ (6,049)
Other comprehensive gain (loss) before reclassifications | (4,503) | (1,111)
Amounts reclassified from accumulated other comprehensive loss | 209 | 89
Impact due to adoption | (557) |
Balance at the end of the period | (7,108) | (7,071)
Unrealized Net Loss on Interest Rate Swap |  |
Changes to accumulated other comprehensive loss by component |  |
Balance at the beginning of the period | (5,023) | (1,530)
Other comprehensive gain (loss) before reclassifications | (4,503) | (1,111)
Amounts reclassified from accumulated other comprehensive loss | 266 | 36
Balance at the end of the period | (9,260) | (2,605)
Other Postretirement Benefit Liability |  |
Changes to accumulated other comprehensive loss by component |  |
Balance at the beginning of the period | 2,209 | 2,118
Amounts reclassified from accumulated other comprehensive loss | (57) | (58)
Balance at the end of the period | $ 2,152 | 2,060
Pension Liability |  |
Changes to accumulated other comprehensive loss by component |  |
Balance at the beginning of the period |  | (6,637)
Amounts reclassified from accumulated other comprehensive loss |  | 110
Balance at the end of the period |  | $ (6,527)

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e637-108580 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=118930883&loc=SL7669686-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e681-108580 + Details
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