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Estimated future benefit payments and subsidies (Details 9) $ in Thousands | Dec. 31, 2016 USD ($)
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Other Postretirement Benefits |
Defined Benefit Plan Disclosure [Line Items] |
Expected future benefit payments, next twelve months | $ 5,410
Prescription drug subsidy receipts, next twelve months | 168
Expected future benefit payments, year two | 5,573
Prescription drug subsidy receipts, year two | 165
Expected future benefit payments, year three | 5,603
Prescription drug subsidy receipts, year three | 160
Expected future benefit payments, year four | 5,500
Prescription drug subsidy receipts, Year Four | 154
Expected future benefit payments, year five | 5,511
Prescription drug subsidy receipts, year five | 146
Expected future benefit payments, five fiscal years thereafter | 27,956
Prescription drug subsidy receipts, after year five | 568
Pension Benefits |
Defined Benefit Plan Disclosure [Line Items] |
Expected future benefit payments, next twelve months | 24,798
Expected future benefit payments, year two | 25,054
Expected future benefit payments, year three | 25,271
Expected future benefit payments, year four | 25,616
Expected future benefit payments, year five | 25,987
Expected future benefit payments, five fiscal years thereafter | $ 132,224

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