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Estimated future benefit payments and subsidies (Details 10) - Underfunded Plan [Member] - Qualified Plan [Member] $ in Thousands | Dec. 31, 2018 USD ($)
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Pension Benefits |
Defined Benefit Plan Disclosure [Line Items] |
Expected future benefit payments, next twelve months | $ 24,026
Expected future benefit payments, year two | 24,287
Expected future benefit payments, year three | 24,633
Expected future benefit payments, year four | 24,929
Expected future benefit payments, year five | 25,173
Expected future benefit payments, five fiscal years thereafter | 124,688
Other Postretirement Benefits |
Defined Benefit Plan Disclosure [Line Items] |
Expected future benefit payments, next twelve months | 5,332
Prescription drug subsidy receipts, next twelve months | 117
Expected future benefit payments, year two | 5,232
Prescription drug subsidy receipts, year two | 112
Expected future benefit payments, year three | 5,201
Prescription drug subsidy receipts, year three | 105
Expected future benefit payments, year four | 5,259
Prescription drug subsidy receipts, year four | 98
Expected future benefit payments, year five | 5,270
Prescription drug subsidy receipts, year five | 90
Expected future benefit payments, five fiscal years thereafter | 25,851
Prescription drug subsidy receipts, after year five | $ 320

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