Employee Benefit Plans (Schedule of the Pretax amounts in Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Prior service cost
Net actuarial loss	22,237	20,637
Total	22,237	20,637
Supplemental Executive Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Prior service cost
Net actuarial loss	2,005	2,169
Total	$ 2,005	$ 2,169