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Retirement Plans, Components of Net Periodic Benefit Cost for the Pension and Postretirement Tables (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
RAP        
Net period benefit cost for the pension and postretirement plans        
Service cost $ 1,713 $ 1,636 $ 5,276 $ 5,086
Interest cost 1,795 1,781 5,307 5,341
Expected return on plan assets (4,929) (5,085) (14,692) (15,215)
Amortization of prior service cost (19) (80) (56) (55)
Amortization of actuarial loss 619 621 1,594 1,586
Total net pension and periodic benefit cost (821) (1,127) (2,571) (3,257)
Postretirement Plan        
Net period benefit cost for the pension and postretirement plans        
Interest cost 26 35 74 107
Amortization of prior service cost (19) 0 (57) 0
Amortization of actuarial loss 2 0 2 0
Total net pension and periodic benefit cost $ 9 $ 35 $ 19 $ 107