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Other comprehensive income (loss) (reclassification adjustments) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Reclassification adjustments [Line Items] |  |
Total reclassifications, net of tax | $ (330) | $ (139)
Prior service credit [Member] |  |
Reclassification adjustments [Line Items] |  |
Amounts reclassified from accumulated other comprehensive loss | 355 | 355
Net actuarial loss [Member] |  |
Reclassification adjustments [Line Items] |  |
Amounts reclassified from accumulated other comprehensive loss | (407) | (575)
Postretirement benefit plans [Member] |  |
Reclassification adjustments [Line Items] |  |
Amounts reclassified from accumulated other comprehensive loss | (52) | (220)
Tax (expense) benefit | (31) | 12
Total reclassifications, net of tax | (83) | (208)
Realized (loss) gain on interest rate swap [Member] |  |
Reclassification adjustments [Line Items] |  |
Amounts reclassified from accumulated other comprehensive loss | (334) | 93
Tax (expense) benefit | 87 | (24)
Total reclassifications, net of tax | $ (247) | $ 69

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