Employee Benefit Plans (Pension And Other Postretirement Benefit Costs) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 2	$ 0	$ 7
Interest cost	2,803	3,688	9,338	10,953
Expected return on plan assets	(4,641)	(5,044)	(13,623)	(15,275)
Curtailments	0	526	454	526
Amortization of other actuarial losses (gains)	2,292	1,395	3,973	6,638
Net benefit cost (credit)	454	567	142	2,849
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	128	216	393	649
Interest cost	951	321	3,223	964
Curtailments	0	0	(970)	0
Amortization of prior service credits	(2,509)	(2,084)	(7,854)	(6,251)
Amortization of other actuarial losses (gains)	283	(527)	(849)	(1,582)
Net benefit cost (credit)	$ (1,147)	$ (2,074)	$ (6,057)	$ (6,220)