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Employee Benefit Plans (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Defined Benefit Plan Disclosure [Line Items]        
Annual benefits paid to retired participants     $ 300  
Other Benefits Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Benfit plan, cash contributions $ 200 $ 200 700 $ 700
Expected cash contributions 700   700  
Pension Benefit Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Benfit plan, cash contributions 1,000 $ 1,000 2,500 $ 2,500
Expected cash contributions $ 800   $ 800