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Contingencies - Accrual for Environmental Remediation (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2017
USD ($)
Environmental remediation accrual at December 31, 2016 $ 57
Payments (9)
Environmental remediation accrual at June 30, 2017 48
Fremont, NC  
Environmental remediation accrual at December 31, 2016 57
Payments (9)
Environmental remediation accrual at June 30, 2017 $ 48