XML 33 R56.htm IDEA: XBRL DOCUMENT v3.20.1
Accumulated Other Comprehensive Income (Loss) (Schedule of Changes in Accumulated Other Comprehensive Income (Loss)) (Details) - Reclassification out of Accumulated Other Comprehensive Income [Member] - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Pre-Tax $ 140 $ 43
After-Tax 140 43
Accumulated Defined Benefit Plans Adjustment, Actuarial Gain (Loss) Attributable to Parent [Member] | Pension Benefits [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Pre-Tax 140 137
After-Tax $ 140 137
Accumulated Defined Benefit Plans Adjustment, Actuarial Gain (Loss) Attributable to Parent [Member] | Postretirement Benefit Plan [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Pre-Tax   (97)
After-Tax   (97)
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member] | Postretirement Benefit Plan [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Pre-Tax   3
After-Tax   $ 3