Pensions and Other Employee Benefits Plans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Components of Net periodic cost
Amortization of prior service credits			$ 338	$ 81
Pension Benefits [Member]
Components of Net periodic cost
Service cost	3,640	3,048	7,279	6,096
Interest cost	6,366	6,327	12,732	12,654
Expected return on plan assets	(6,243)	(5,813)	(12,486)	(11,626)
Amortization net actuarial loss or (gain)	2,967	1,390	5,935	2,780
Amortization of prior service credits	(679)	(679)	(1,359)	(1,358)
Net periodic cost	6,051	4,273	12,101	8,546
Net periodic cost included in income from discontinued operations	(5,420)	(3,759)	(10,839)	(7,517)
Net periodic cost included in income from continuing operations	631	514	1,262	1,029
Other Benefits [Member]
Components of Net periodic cost
Service cost	152	181	304	362
Interest cost	763	837	1,526	1,674
Expected return on plan assets		(4)		(8)
Amortization net actuarial loss or (gain)	(94)	(197)	(188)	(394)
Amortization of prior service credits	(182)	(182)	(364)	(364)
Net periodic cost	639	635	1,278	1,270
Net periodic cost included in income from discontinued operations	(630)	(643)	(1,260)	(1,286)
Net periodic cost included in income from continuing operations	$ 9	$ (8)	$ 18	$ (16)