XML 60 R47.htm IDEA: XBRL DOCUMENT v3.7.0.1
Retirement Benefit Plans (Components of Net Periodic Benefit Cost) (Details) - Defined Benefit Plan - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Defined Benefit Plan Disclosure [Line Items]        
Service cost     $ 2 $ 6
Interest cost     416 644
Expected return on plan assets     (637) (922)
Amortization of net loss     216 362
Net periodic benefit cost (credit) $ (2) $ 45 (3) 90
Hourly Employees’ Pension Plan        
Defined Benefit Plan Disclosure [Line Items]        
Service cost     0 4
Interest cost     0 200
Expected return on plan assets     0 (324)
Amortization of net loss     0 142
Net periodic benefit cost (credit)     0 22
Employees’ Retirement Plan        
Defined Benefit Plan Disclosure [Line Items]        
Service cost     2 2
Interest cost     416 444
Expected return on plan assets     (637) (598)
Amortization of net loss     216 220
Net periodic benefit cost (credit)     $ (3) $ 68