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Description of the Business and Summary of Significant Accounting Policies - Other Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Other Liabilities [Abstract] |  |
Pension and postretirement benefits liability | $ 32,686 | $ 32,670
Deferred compensation liability | 31,277 | 29,174
Derivative liabilities | 27,819 | 2,174
Other | 997 | 953
Total other liabilities | $ 92,779 | $ 64,971

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