Health Care, Pension and Other Benefits (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Domestic Defined Benefit Pension Plans [Member]
Net periodic benefit cost (credit):
Service cost	$ 5,637	$ 5,396
Interest cost	6,526	4,267
Expected return on assets	(12,666)	(10,342)
Amortization of:
Prior service cost (credit)	459	456
Actuarial loss		3,488
Net periodic benefit cost (credit)	(44)	3,265
Foreign Defined Benefit Pension Plans [Member]
Net periodic benefit cost (credit):
Service cost	1,547	1,160
Interest cost	2,694	1,902
Expected return on assets	(2,740)	(1,782)
Amortization of:
Actuarial loss	356	442
Net periodic benefit cost (credit)	1,857	1,722
Postretirement Benefits Other than Pensions [Member]
Net periodic benefit cost (credit):
Service cost	609	765
Interest cost	3,195	3,046
Amortization of:
Prior service cost (credit)	(126)	(82)
Actuarial loss		983
Net periodic benefit cost (credit)	$ 3,678	$ 4,712