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Retirement Benefit Plans (Schedule of Net Periodic Benefit Cost) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Pension Plans, Defined Benefit    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 12 $ 13
Interest cost 1,287 1,273
Expected return on plan assets (1,844) (1,890)
Amortization of net loss 724 649
Recognition of Settlement 2,889  
Net periodic benefit cost 3,068 45
Supplemental Employee Retirement Plans, Defined Benefit    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 176 121
Interest cost 175 137
Amortization of prior service cost 364 342
Net periodic benefit cost 715 600
Hourly Employees’ Pension Plan | Pension Plans, Defined Benefit    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 8 9
Interest cost 401 405
Expected return on plan assets (648) (661)
Amortization of net loss 284 248
Recognition of Settlement 2,889  
Net periodic benefit cost 2,934 1
Employees’ Retirement Plan | Pension Plans, Defined Benefit    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 4 4
Interest cost 886 868
Expected return on plan assets (1,196) (1,229)
Amortization of net loss 440 401
Recognition of Settlement 0  
Net periodic benefit cost $ 134 $ 44