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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 Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined contribution plan expense recognized $ 1,603 $ 1,486  
Pension Benefits [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Cash payment for settlement of postretirement benefit plan obligation  
Benefit obligation 48,590 54,319 $ 53,293
Defined benefit plan, future amortization of net gains (losses) 530    
Pension Benefits [Member] | Minimum [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Contributions to pension plan 0    
Postretirement Benefit Plan [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Cash payment for settlement of postretirement benefit plan obligation  
Benefit obligation 5,370 $ 5,956 $ 6,172
Defined benefit plan, future amortization of net gains (losses) (281)    
Defined Benefit Plan, Future Amortization of Prior Service Cost (Credit) $ 14