Pension Plan (Components Of Net Periodic Benefit Expense) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	$ 1,317	$ 1,264
Interest cost	1,271	1,217
Expected return on plan assets	(2,863)	(2,737)
Amortization of prior service cost	0	0
Recognized net actuarial loss	144	193
Benefit expense	(131)	(63)
Pension plan contributions	$ 0	$ 0