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Estimated future benefit payments and subsidies (Details 10) - Underfunded Plan [Member] - Qualified Plan [Member]
$ in Thousands
Dec. 31, 2018
USD ($)
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