Employee Benefit Plans (Components Of Net Benefit Expense) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
General Discussion of Pension and Other Postretirement Benefits [Abstract]
Interest cost on benefits obligation		$ 2,185	$ 2,193	$ 2,181
Expected return on assets		(2,562)	(2,655)	(2,788)
Net pension costs and return		(377)	(462)	(607)
Net loss amortization		893	843	506
Total amortization items		893	843	506
Defined Benefit Plan, Settlements, Plan Assets	$ 4,500	4,457	0	0
Net periodic cost of defined benefits plans		4,973	381	(101)
Cost of 401(k) plan company contributions		$ 1,509	$ 2,886	$ 3,269