Employee Benefit Plans (Amounts Not Yet Reflected In Net Periodic Benefit Cost And Included In Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Prior service cost
Accumulated income (loss)	(96,965)	(91,920)
Accumulated other comprehensive income (loss)	(96,965)	(91,920)
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated other comprehensive income (loss)	(96,965)	(91,920)	$ (102,692)
Post-Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Prior service cost	662
Accumulated income (loss)	(4,471)	(5,139)
Accumulated other comprehensive income (loss)	$ (3,809)	$ (5,139)	$ (12,670)