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Employee Benefit Plans (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]      
Benefits paid $ 2,341 $ 2,031  
Defined contribution plan, contribution amount $ 1,109 925 $ 658
Fixed Income [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Target plan asset 51.00%    
U.S. Equity [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Target plan asset 19.00%    
Non-U.S. Equity Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Target plan asset 30.00%    
Defined Benefit Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Accumulated benefit obligation $ 83,724 85,236  
Recognized prior service (cost) benefit 0    
Net gains (losses) as a component of net periodic benefit cost 1,634    
Supplemental Executive Retirement Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Accumulated benefit obligation 8,830 8,734  
Benefits paid 260 247 247
Recognized prior service (cost) benefit 0    
Net gains (losses) as a component of net periodic benefit cost 277    
Noncontributory Profit Sharing Program [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Contributions for plan $ 6,810 $ 5,799 $ 5,367