Health Care, Pension and Other Benefits (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Domestic Defined Benefit Pension Plans [Member]
Net periodic benefit cost (credit):
Service cost	$ 5,636	$ 5,396	$ 16,910	$ 16,189
Interest cost	6,526	4,267	19,577	12,801
Expected return on assets	(12,666)	(10,342)	(37,997)	(31,026)
Amortization of:
Prior service cost (credit)	459	456	1,377	1,367
Actuarial loss		3,489		10,465
Net periodic benefit cost (credit)	(45)	3,266	(133)	9,796
Foreign Defined Benefit Pension Plans [Member]
Net periodic benefit cost (credit):
Service cost	1,547	1,160	4,642	3,480
Interest cost	2,695	1,902	8,083	5,707
Expected return on assets	(2,739)	(1,783)	(8,219)	(5,347)
Amortization of:
Actuarial loss	356	443	1,067	1,327
Net periodic benefit cost (credit)	1,859	1,722	5,573	5,167
Postretirement Benefits Other than Pensions [Member]
Net periodic benefit cost (credit):
Service cost	609	765	1,826	2,296
Interest cost	3,195	3,046	9,586	9,137
Amortization of:
Prior service cost (credit)	(126)	(82)	(377)	(246)
Actuarial loss		983		2,950
Net periodic benefit cost (credit)	$ 3,678	$ 4,712	$ 11,035	$ 14,137