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Pension and Postretirement Benefit Plans (Schedule of Funded Status for the Pension and Postretirement Benefit Plans) (Details) - Postretirement Benefits Plan [Member] - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]      
Funded status $ (109) $ (118) $ (128)
Unrecognized net actuarial loss 0 0 0
Unrecognized net transition obligation 0 0 0
Unrecognized prior service cost 0 0 0
Accrued benefits (109) (118) (128)
Accrued liability (109) (118) (128)
Amounts Recognized in Consolidated Balance Sheets (109) (118) (128)
Net actuarial loss (gain) (54) (58) (58)
Net transition obligation 0 0 0
Deferred tax liability 10 19 19
Amounts recognized in Accumulated Other Comprehensive Income $ (44) $ (39) $ (39)