Employee Benefit Plans (Pension And Other Postretirement Benefit Costs) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 2	$ 4,910	$ 7	$ 16,311
Interest cost	3,688	4,278	10,953	12,834
Expected return on plan assets	(5,044)	(5,929)	(15,275)	(17,786)
Curtailments	526	1,504	526	1,504
Amortization of prior service cost (credit)	0	(51)	0	(158)
Amortization of other actuarial losses (gains)	1,395	741	6,638	2,221
Net benefit cost (credit)	567	5,453	2,849	14,926
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	216	383	649	1,267
Interest cost	321	460	964	1,381
Amortization of prior service cost (credit)	(2,084)	(2,500)	(6,251)	(7,502)
Amortization of other actuarial losses (gains)	(527)	(191)	(1,582)	(571)
Net benefit cost (credit)	$ (2,074)	$ (1,848)	$ (6,220)	$ (5,425)