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Estimated future benefit payments and subsidies (Details 10) $ in Thousands | Dec. 31, 2015 USD ($)
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Other Postretirement Benefits |
Defined Benefit Plan Disclosure [Line Items] |
Expected future benefit payments, next twelve months | $ 5,234
Prescription drug subsidy receipts, next twelve months | 197
Expected future benefit payments, year two | 5,351
Prescription drug subsidy receipts, year two | 191
Expected future benefit payments, year three | 5,420
Prescription drug subsidy receipts, year three | 183
Expected future benefit payments, year four | 5,441
Prescription drug subsidy receipts, Year Four | 175
Expected future benefit payments, year five | 5,331
Prescription drug subsidy receipts, year five | 168
Expected future benefit payments, five fiscal years thereafter | 27,261
Prescription drug subsidy receipts, after year five | 688
Pension Benefits |
Defined Benefit Plan Disclosure [Line Items] |
Expected future benefit payments, next twelve months | 24,223
Expected future benefit payments, year two | 24,680
Expected future benefit payments, year three | 24,980
Expected future benefit payments, year four | 25,323
Expected future benefit payments, year five | 25,700
Expected future benefit payments, five fiscal years thereafter | $ 133,029

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