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Employee Benefit Plans (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Defined Benefit Plan Disclosure [Line Items]    
Annual benefits paid to retired participants $ 400  
Pension Benefit Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Benfit plan, cash contributions 500 $ 500
Expected cash contributions 3,100  
Other Benefits Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Benfit plan, cash contributions 200 $ 200
Expected cash contributions $ 1,200