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Other comprehensive income (loss) (reclassification adjustments) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Reclassification adjustments [Line Items]        
Total reclassifications, net of tax $ (449) $ (321) $ (1,004) $ (1,082)
Prior service credit [Member]        
Reclassification adjustments [Line Items]        
Amounts reclassified from accumulated other comprehensive loss 355 355 1,066 1,066
Net actuarial loss [Member]        
Reclassification adjustments [Line Items]        
Amounts reclassified from accumulated other comprehensive loss (575) (806) (1,725) (2,417)
Postretirement benefit plans [Member]        
Reclassification adjustments [Line Items]        
Amounts reclassified from accumulated other comprehensive loss (220) (451) (659) (1,351)
Tax benefit 12 70 35 209
Total reclassifications, net of tax (208) (381) (624) (1,142)
Realized (loss) gain on interest rate swap [Member]        
Reclassification adjustments [Line Items]        
Amounts reclassified from accumulated other comprehensive loss (326) 81 (514) 81
Tax benefit 85 (21) 134 (21)
Total reclassifications, net of tax $ (241) $ 60 $ (380) $ 60