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Employee Benefit Plans (Components Of Net Periodic Benefit Expense) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Employee Benefit Plans [Abstract]        
Service cost $ 721 $ 581 $ 1,442 $ 1,162
Interest cost on projected benefit obligation 602 583 1,203 1,166
Expected return on plan assets (1,150) (1,205) (2,300) (2,410)
Amortization of prior service credit (12) (12) (24) (24)
Amortization of net actuarial losses 239 235 478 471
Net periodic pension expense $ 400 $ 182 $ 799 $ 365