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Employee Benefit Plans (Employee Benefit Reconciliation) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Service cost $ 675 $ 603 $ 452
Interest cost 2,806 2,773 2,878
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 74,932    
Fair value of plan assets at end of year 66,307 74,932  
Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Accumulated Benefit Obligation 80,776 87,765  
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Projected benefit obligation at beginning of year 87,765 82,005  
Service cost 675 603  
Interest cost 2,806 2,773  
Actuarial (gain) loss (7,430) 6,556  
Defined Benefit Plan, Benefit Obligation, Benefits Paid (2,104) (1,976)  
Settlement (936) (2,196)  
Projected benefit obligation at end of year 80,776 87,765 82,005
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 74,932 69,061  
Actual gain (loss) on plan assets (5,585) 10,043  
Defined Benefit Plan, Plan Assets, Benefits Paid (2,104) (1,976)  
Settlement (936) (2,196)  
Fair value of plan assets at end of year 66,307 74,932 $ 69,061
Funded status $ (14,469) $ (12,833)