Annual report pursuant to Section 13 and 15(d)

Postretirement Benefits, Schedule of Amounts in Accumulated Other Comprehensive Income to be charged next year (Details)

v3.6.0.2
Postretirement Benefits, Schedule of Amounts in Accumulated Other Comprehensive Income to be charged next year (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
Defined Benefit Plan, Amount to be Amortized from Accumulated Other Comprehensive Income (Loss) Next Fiscal Year [Abstract]  
Amortization of prior service credit $ (51)
Amortization of net actuarial loss 3,156
Total $ 3,105