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Accumulated Other Comprehensive Income (Loss) (Components of Accumulated Other Comprehensive Income (Loss)) (Details) - Accumulated Defined Benefit Plans Adjustment Including Portion Attributable to Noncontrolling Interest [Member] - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive loss, net of tax $ (8,101) $ (8,188)
Pension Benefits [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive loss, net of tax (10,030) (10,304)
Accumulated other comprehensive loss, tax 6,282 6,282
Postretirement Benefit Plan [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive loss, net of tax 1,929 2,116
Accumulated other comprehensive loss, tax $ 527 $ 527