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Accumulated Other Comprehensive Loss - Summary of Changes in Accumulated Other Comprehensive Loss by Component (Details) - USD ($) $ in Thousands | 9 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Mar. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Beginning balance | $ 644,729 |  |  |  |
Transition adjustment | (831,265) |  |  |  | $ (495,514)
Transition adjustment | (69,052) |  |  |  | $ (28,159)
Ending balance | 271,926 |  |  |  |
Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Transition adjustment |  |  | $ (5,300) |  |
Transition adjustment |  |  |  | $ 2,200 |
Interest Rate Derivatives [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Beginning balance | 1,634 |  |  |  |
Losses arising during period | (39,965) | $ (3,789) |  |  |
Amounts reclassified from accumulated other comprehensive loss | 6,479 | (1,197) |  |  |
Net other comprehensive income (loss) | (33,486) | (4,986) |  |  |
Ending balance | (31,852) | (4,986) |  |  |
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Beginning balance | (23,916) | (21,814) |  |  |
Losses arising during period | (11,167) | (5,164) |  |  |
Amounts reclassified from accumulated other comprehensive loss | 1,444 | 1,635 |  |  |
Income tax benefit |  | (880) |  |  |
Net other comprehensive income (loss) | (9,723) | (2,649) |  |  |
Ending balance | (33,639) | (27,170) |  |  |
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Transition adjustment |  | (2,707) |  |  |
Accumulated Other-than-Temporary Impairment Attributable to Parent [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Beginning balance | (5,877) | (6,210) |  |  |
Amounts reclassified from accumulated other comprehensive loss | 158 | 249 |  |  |
Net other comprehensive income (loss) | 158 | 249 |  |  |
Ending balance | (3,561) | (5,961) |  |  |
Accumulated Other-than-Temporary Impairment Attributable to Parent [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Transition adjustment | 2,158 |  |  |  |
AOCI Attributable to Parent [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Beginning balance | (28,159) | (28,024) |  |  |
Losses arising during period | (51,132) | (8,953) |  |  |
Amounts reclassified from accumulated other comprehensive loss | 8,081 | 687 |  |  |
Income tax benefit |  | (880) |  |  |
Net other comprehensive income (loss) | (43,051) | (7,386) |  |  |
Ending balance | (69,052) | (38,117) |  |  |
AOCI Attributable to Parent [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Transition adjustment | $ 2,158 | $ (2,707) |  |  |

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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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)(a)(4)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: 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=121641772&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(23)(a)(3)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 4: 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 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (g)(2)(ii) -URI http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641 Reference 7: 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=121641772&loc=d3e681-108580 + Details
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