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Other Income, Net (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Other Income and Expenses [Abstract]    
Interest income $ 156 $ 143
Other nonoperating income 6 155
Defined Benefit Plan, Non-service Costs (471) (678)
Insurance policy expense (47) (49)
Other nonoperating expense (3) (3)
Other (expense), net $ (359) $ (432)