Health Care, Pension and Other Benefits (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Amortization of:
Net periodic benefit cost			$ 7,928	$ 8,926
Domestic Defined Benefit Pension Plans [Member]
Net periodic benefit cost:
Service costs	4,007	4,264	8,014	8,453
Interest costs	4,707	4,574	9,414	9,014
Expected return on assets	(11,611)	(10,640)	(23,221)	(21,155)
Amortization of:
Prior service cost (credit)	409	415	818	830
Actuarial loss	4,877	4,781	9,754	9,472
Net periodic benefit cost	2,389	3,394	4,779	6,614
Foreign Defined Benefit Pension Plans [Member]
Net periodic benefit cost:
Service costs	961	488	1,896	989
Interest costs	1,094	1,003	2,164	2,039
Expected return on assets	(681)	(695)	(1,346)	(1,410)
Amortization of:
Prior service cost (credit)		7		14
Actuarial loss	220	333	435	680
Net periodic benefit cost	1,594	1,136	3,149	2,312
Postretirement Benefits Other than Pensions [Member]
Net periodic benefit cost:
Service costs	874	883	1,748	1,766
Interest costs	3,895	4,016	7,790	8,033
Amortization of:
Prior service cost (credit)	(164)	(164)	(328)	(328)
Actuarial loss	626	326	1,252	652
Net periodic benefit cost	$ 5,231	$ 5,061	$ 10,462	$ 10,123