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Other Noncurrent Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Noncurrent liabilities and noncurrent assets    
Deferred compensation trusts $ 381,826 $ 348,487
Noncurrent liabilities    
Noncurrent liabilities and noncurrent assets    
Deferred compensation and retirement obligations included in noncurrent liabilities 395,000 356,000
Accrued retention amount related to insurance coverages $ 56,000 $ 65,000