Pensions And Other Employee Benefits (Components Of Net Periodic Cost) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service credit	$ 876	$ (1,029)	$ 412
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	12,265	10,677	9,436
Interest cost	25,504	24,673	24,447
Expected return on plan assets	(23,552)	(20,641)	(17,176)
Amortization of prior service credit	(2,719)	(2,719)	(2,719)
Amortization of net actuarial loss (gain)	5,379	3,536	4,083
Net periodic cost	16,877	15,526	18,071
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	522	672	863
Interest cost	3,198	3,411	3,965
Expected return on plan assets	(12)	(31)	(50)
Amortization of prior service credit	(728)	(728)	(481)
Amortization of net actuarial loss (gain)	(1,056)	(1,118)	(471)
Net periodic cost	$ 1,924	$ 2,206	$ 3,826