Employee Benefit Plans (Pension And Other Postretirement Benefit Costs) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Curtailments	$ (1,770)
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	27,466	16,490	15,870
Interest cost	15,668	16,253	15,822
Curtailments	(687)
Expected return on plan assets	(22,030)	(21,812)	(19,392)
Amortization of prior service cost (credit)	259	(189)	173
Amortization of other actuarial (gains) losses	14,666	8,748	7,130
Total net benefit	36,353	19,490	19,603
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	2,142	3,917	1,509
Interest cost	2,020	3,279	2,083
Curtailments	(708)
Expected return on plan assets	0	0	0
Amortization of prior service cost (credit)	(11,458)	(2,364)	(2,364)
Amortization of other actuarial (gains) losses	(522)	(3,100)	(2,918)
Total net benefit	$ (11,867)	$ 1,732	$ (1,690)