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Accumulated Other Comprehensive Income (Loss) - Summary of Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | $ 944,764 | $ 823,116 | $ 786,760
Other comprehensive income (loss) before reclassifications | (196) | (3,581) | 3,159
Amounts reclassified out of accumulated other comprehensive income (loss) | (1,358) | (2,714) | (233)
Other comprehensive income (loss) | (1,554) | (6,295) | 2,926
Ending Balance | 814,805 | 944,764 | 823,116
Other comprehensive income (loss) before reclassifications, tax expense | 337 | (836) | 548
Amounts reclassified out of accumulated other comprehensive income (loss), tax expense | (555) | (1,108) | (88)
Other comprehensive income (loss) before reclassifications, tax expense | 337 | (836) | 548
Tax benefit associated with change in pension actuarial loss | (507) | (734) | 726
Amounts reclassified out of accumulated other comprehensive income (loss), tax expense | (555) | (1,108) | (88)
Gains and (Losses) on Cash Flow Hedges |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | (1,326) | 3,034 | 1,750
Other comprehensive income (loss) before reclassifications | 1,140 | (1,646) | 1,517
Amounts reclassified out of accumulated other comprehensive income (loss) | (1,358) | (2,714) | (233)
Other comprehensive income (loss) | (218) | (4,360) | 1,284
Ending Balance | (1,544) | (1,326) | 3,034
Defined Benefit Pension Plan |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | (736) | 1,199 | (443)
Other comprehensive income (loss) before reclassifications | (1,336) | (1,935) | 1,642
Amounts reclassified out of accumulated other comprehensive income (loss) | 0 | 0 | 0
Other comprehensive income (loss) | (1,336) | (1,935) | 1,642
Ending Balance | (2,072) | (736) | 1,199
Accumulated Other Comprehensive Income (Loss) |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | (2,062) | 4,233 | 1,307
Ending Balance | $ (3,616) | $ (2,062) | $ 4,233

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- Definition Amount of tax expense (benefit) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e640-108580 + Details
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- Definition Amount after tax, before reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32136-110900 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -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 3: 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 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=121640130&loc=d3e1436-108581 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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