Pension and Other Postretirement Benefits (Details 5) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Defined Benefit Plan Disclosure [Line Items]
Accrued liabilities	$ 8,405	$ 8,401
Accrued retirement benefits	152,696	112,886
Accumulated other non-owner changes to equity, net	(130,653)	(89,298)	(83,781)	(95,529)
Defined benefit pension plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Other assets	3,611	7,426
Accrued liabilities	3,091	3,175
Accrued retirement benefits	101,576	61,331
Accumulated other non-owner changes to equity, net	(125,052)	(86,254)
Net actuarial loss	(122,568)	(83,105)
Prior service costs	(2,484)	(3,149)
Defined benefit pension plans, U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Other assets	3,325	7,364
Accrued liabilities	2,705	2,725
Accrued retirement benefits	95,064	49,154
Accumulated other non-owner changes to equity, net	(104,960)	(66,543)
Net actuarial loss	(103,025)	(64,031)
Prior service costs	(1,935)	(2,512)
Defined benefit pension plans, Non-U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Other assets	286	62
Accrued liabilities	386	450
Accrued retirement benefits	6,512	12,177
Accumulated other non-owner changes to equity, net	(20,092)	(19,711)
Net actuarial loss	(19,543)	(19,074)
Prior service costs	(549)	(637)
Other postretirement benefit plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Accrued liabilities	5,314	5,226
Accrued retirement benefits	49,273	49,962
Accumulated other non-owner changes to equity, net	(5,601)	(3,044)
Net actuarial loss	(10,194)	(7,118)
Prior service costs	$ 4,593	$ 4,074