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Other Noncurrent Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Other Noncurrent Liabilities [Line Items]    
Deferred compensation trusts $ 350,427 $ 341,235
Noncurrent liabilities    
Other Noncurrent Liabilities [Line Items]    
Deferred compensation and retirement obligations 329,000 338,000
Insurance liabilities $ 70,000 $ 80,000