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Other comprehensive income (loss) (reclassification adjustments) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Reclassification adjustments [Line Items] |  |  |  |
Total reclassifications, net of tax | $ (326) | $ (416) | $ (656) | $ (555)
Prior service credit [Member] |  |  |  |
Reclassification adjustments [Line Items] |  |  |  |
Amounts reclassified from accumulated other comprehensive loss | 355 | 355 | 711 | 711
Net actuarial loss [Member] |  |  |  |
Reclassification adjustments [Line Items] |  |  |  |
Amounts reclassified from accumulated other comprehensive loss | (407) | (575) | (814) | (1,150)
Postretirement benefit plans [Member] |  |  |  |
Reclassification adjustments [Line Items] |  |  |  |
Amounts reclassified from accumulated other comprehensive loss | (52) | (220) | (103) | (439)
Tax (expense) benefit | (31) | 12 | (63) | 23
Total reclassifications, net of tax | (83) | (208) | (166) | (416)
Realized loss gain on interest rate swap [Member] |  |  |  |
Reclassification adjustments [Line Items] |  |  |  |
Amounts reclassified from accumulated other comprehensive loss | (330) | (281) | (664) | (188)
Tax (expense) benefit | 87 | 73 | 174 | 49
Total reclassifications, net of tax | $ (243) | $ (208) | $ (490) | $ (139)

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