Employee Benefit Plans (Pension And Other Postretirement Benefit Costs) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 5,924	$ 7,700
Interest cost	4,364	3,926
Expected return on plan assets	(5,978)	(5,806)
Amortization of prior service cost (credit)	(54)	(158)
Amortization of other actuarial (gains) losses	948	4,551
Net benefit cost	5,204	10,213
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	444	556
Interest cost	464	431
Amortization of prior service cost (credit)	(2,501)	(2,750)
Amortization of other actuarial (gains) losses	(170)	77
Net benefit cost	$ (1,763)	$ (1,686)