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Composition of Certain Financial Statement Captions - Schedule of Other Accrued Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Other Accrued Liabilities    
Workers' compensation, auto and general liability reserve $ 6,123 $ 7,537
Defense Base Act insurance financing 0 2,727
Other accrued liabilities 11,570 15,004
Total $ 17,693 $ 25,268