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Estimated future benefit payments and subsidies (Details 10)
$ in Thousands
Dec. 31, 2015
USD ($)
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