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Schedule I - Condensed Financial Information of the Parent (Condensed Statements of Comprehensive Income) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Condensed Financial Statements, Captions [Line Items]    
Other, net $ (527) $ (9)
Other (income) expense (4,579) 1,461
Administrative and general expenses 53,783 49,192
Income tax benefit 3,767 7,378
Net income 39,632 34,785
Pension settlement, net of $202 tax benefit in 2019 671 0
Reclassification of pension and postretirement adjustments into earnings, net of $90 and $85 tax benefit in 2019 and 2018, respectively 845 489
Total other comprehensive income 2,274 188
Comprehensive income 41,906 34,973
Current period pension and postretirement plan adjustment, tax benefit 226 (14)
Pension settlement, tax (202) 0
Reclassification of pension and post retirement adjustments into earnings, tax benefit (90) (85)
Parent Company    
Condensed Financial Statements, Captions [Line Items]    
Intercompany interest expense 1,190 1,223
Other, net (1,796) (613)
Other (income) expense (606) 610
Administrative and general expenses 6,403 5,962
Loss before income taxes (5,797) (6,572)
Income tax benefit (3,819) (676)
Net loss before equity in earnings of subsidiaries (1,978) (5,896)
Equity in earnings of subsidiaries 41,610 40,681
Net income 39,632 34,785
Current period pension and postretirement plan adjustment, net of $226 expense and $14 tax benefit in 2019 and 2018, respectively 758 (301)
Pension settlement, net of $202 tax benefit in 2019 671 0
Reclassification of pension and postretirement adjustments into earnings, net of $90 and $85 tax benefit in 2019 and 2018, respectively 845 489
Total other comprehensive income 2,274 188
Comprehensive income 41,906 34,973
Current period pension and postretirement plan adjustment, tax benefit 226 (14)
Pension settlement, tax (202) 0
Reclassification of pension and post retirement adjustments into earnings, tax benefit $ (90) $ (85)