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Defined Benefit Plans (Net Periodic Benefit Costs) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Pension Benefits [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 82 $ 9 $ 242 $ 26
Interest cost 107 11 322 32
Expected return on plan assets (106)   (317)  
Amortization (accretion) of prior service cost 4 4 13 11
Settlement gain (117)   (497)  
Net periodic benefit (income) expense (30) 24 (237) 69
Other Benefits [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 1 1 3 3
Interest cost 4 5 13 15
Amortization (accretion) of prior service cost $ (5) $ (6) (15) (17)
Net periodic benefit (income) expense     $ 1 $ 1