Pension and Other Postretirement Benefits (Details 5) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Accrued liabilities	$ 8,184	$ 8,405
Accrued retirement benefits	159,103	152,696
Defined benefit pension plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Other assets	2,819	3,611
Accrued liabilities	3,109	3,091
Accrued retirement benefits	108,473	101,576
Accumulated other non-owner changes to equity, net	(140,108)	(125,052)
Net actuarial loss	(138,066)	(122,568)
Prior service costs	(2,042)	(2,484)
Defined benefit pension plans, U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Other assets	2,819	3,325
Accrued liabilities	2,720	2,705
Accrued retirement benefits	99,935	95,064
Accumulated other non-owner changes to equity, net	(116,305)	(104,960)
Net actuarial loss	(114,748)	(103,025)
Prior service costs	(1,557)	(1,935)
Defined benefit pension plans, Non-U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Other assets	0	286
Accrued liabilities	389	386
Accrued retirement benefits	8,538	6,512
Accumulated other non-owner changes to equity, net	(23,803)	(20,092)
Net actuarial loss	(23,318)	(19,543)
Prior service costs	(485)	(549)
Other postretirement benefit plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Accrued liabilities	5,075	5,314
Accrued retirement benefits	48,913	49,273
Accumulated other non-owner changes to equity, net	(6,286)	(5,601)
Net actuarial loss	(9,895)	(10,194)
Prior service costs	$ 3,609	$ 4,593