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Employee Benefit Plans (Employee Benefit Reconciliation) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Service cost $ 603 $ 452 $ 240
Interest cost 2,773 2,878 3,394
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 69,061    
Fair value of plan assets at end of year 74,932 69,061  
Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Accumulated Benefit Obligation 87,765 82,005  
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Projected benefit obligation at beginning of year 82,005 78,437  
Service cost 603 452  
Interest cost 2,773 2,878  
Actuarial (gain) loss 6,556 4,844  
Defined Benefit Plan, Benefit Obligation, Benefits Paid (1,976) (1,814)  
Settlement (2,196) (2,792)  
Projected benefit obligation at end of year 87,765 82,005 78,437
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 69,061 67,168  
Actual gain on plan assets 10,043 6,499  
Defined Benefit Plan, Plan Assets, Benefits Paid (1,976) (1,814)  
Settlement (2,196) (2,792)  
Fair value of plan assets at end of year 74,932 69,061 $ 67,168
Funded status $ (12,833) $ (12,944)