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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, 2016
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]      
Funded status $ (118) $ (128) $ (137)
Unrecognized net actuarial loss 0 0 0
Unrecognized net transition obligation 0 0 0
Unrecognized prior service cost 0 0 0
Accrued benefits (118) (128) (137)
Accrued liability (118) (128) (137)
Amounts Recognized in Consolidated Balance Sheets (118) (128) (137)
Net actuarial loss (gain) (58) (58) (58)
Net transition obligation 0 0 0
Deferred tax liability 19 19 19
Amounts recognized in Accumulated Other Comprehensive Income $ (39) $ (39) $ (39)