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Accrued Expenses and Other Liabilities - Other liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Other liabilities    
Income taxes payable $ 1,256 $ 3,846
Other Assets    
Other liabilities    
Deferred compensation plan assets 3,200 3,400
Other Liabilities    
Other liabilities    
Deferred compensation plan liabilities 3,500 4,700
Asset retirement obligations 3,200 3,300
Medical and dental benefits 2,200 $ 2,200
Income taxes payable $ 1,000