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Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accumulated Other Comprehensive Loss [Roll Forward] |  |  |  |
Beginning balance |  | $ 260,503 | $ 274,629 |
Other Comprehensive Income (Loss) [Abstract] |  |  |  |
Ending balance |  | 252,967 | 260,503 | $ 274,629
Accumulated Other Comprehensive Loss [Member] |  |  |  |
Accumulated Other Comprehensive Loss [Roll Forward] |  |  |  |
Beginning balance |  | (2,087) | (1,465) | (2,144)
Other Comprehensive Income (Loss) [Abstract] |  |  |  |
Ending balance |  | (2,560) | (2,087) | (1,465)
Defined Benefit Pension Plan [Member] |  |  |  |
Other Comprehensive Income (Loss) [Abstract] |  |  |  |
Other comprehensive income (loss), before tax |  | (632) | (860) | 905
Tax expense (benefit) |  | (159) | (238) | 226
Total other comprehensive income (loss) |  | (473) | (622) | 679
Defined Benefit Pension Plan Net Gain (Loss) [Member] |  |  |  |
Other Comprehensive Income (Loss) [Abstract] |  |  |  |
Other comprehensive income (loss) before reclassifications |  | (791) | (906) | 769
Reclassification from accumulated other comprehensive loss | [1] | $ 159 | $ 46 | $ 136
[1] | These amounts are included in the computation of net periodic pension costs and were reclassified to selling, general and administrative costs.

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- Definition Amount after tax of other comprehensive income (loss) attributable to parent entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669625-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4569643-111683 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669619-108580 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4569616-111683 + Details
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