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Accumulated Other Comprehensive Income (Loss) (Components of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive loss, net of tax $ 46,406 $ 87,300 $ 117,154 $ 128,996 $ 164,201 $ 193,610
Accumulated Defined Benefit Plans Adjustment Including Portion Attributable to Noncontrolling Interest [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive loss, net of tax (10,359)   (10,780)      
Pension Benefits [Member] | Accumulated Defined Benefit Plans Adjustment Including Portion Attributable to Noncontrolling Interest [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive loss, net of tax (10,359)   (10,780)      
Accumulated other comprehensive loss, tax $ 6,282   $ 6,282