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Summary of Significant Accounting Policies, Other Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Other Liabilities [Abstract] |  |
Deferred tax liabilities | $ 626 | $ 10,741
Reserve for other tax liabilities | 22,731 | 17,121
Liability for deferred compensation plan | 47,543 | 43,238
Pension plan benefits reserve | 2,981 | 3,454
Finance lease liabilities | 7,728 | 0
Asset retirement obligation | 6,717 | 6,631
Other | 13,955 | 15,610
Total other liabilities | $ 102,281 | $ 96,795

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