Employee Benefit Plans (Pension And Other Postretirement Benefit Costs) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 4
Interest cost	3,338	3,570
Expected return on plan assets	(4,538)	(5,764)
Amortization of other actuarial losses (gains)	757	2,058
Net benefit cost (credit)	(443)	(132)
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	160	233
Interest cost	1,134	335
Amortization of prior service credits	(2,673)	(2,084)
Amortization of other actuarial losses (gains)	(566)	(456)
Net benefit cost (credit)	$ (1,945)	$ (1,972)