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Contingencies - Accrual for Environmental Remediation (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2015
USD ($)
Environmental remediation accrual at December 31, 2014 $ 266
Estimated Costs 0
Payments (20)
Environmental remediation accrual at June 30, 2015 246
Bridgeport, CT  
Environmental remediation accrual at December 31, 2014 6
Estimated Costs 0
Payments (6)
Environmental remediation accrual at June 30, 2015 0
Fremont, NC  
Environmental remediation accrual at December 31, 2014 260
Estimated Costs 0
Payments (14)
Environmental remediation accrual at June 30, 2015 $ 246