Pensions And Other Employee Benefits Plans (Components Of Net Periodic Cost) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service credits	$ 2,013	$ 332
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	3,639	3,048
Interest cost	6,366	6,327
Expected return on plan assets	(6,243)	(5,813)
Amortization net actuarial loss or (gain)	2,968	1,390
Amortization of prior service credits	(680)	(679)
Net periodic cost	6,050	4,273
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	152	181
Interest cost	763	837
Expected return on plan assets		(4)
Amortization net actuarial loss or (gain)	(94)	(197)
Amortization of prior service credits	(182)	(182)
Net periodic cost	$ 639	$ 635