Retirement Plans and Postretirement Medical Benefits (Components of Net Periodic Benefit Cost for Defined Benefit Pension Plans) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost			$ 3,563	$ 3,328	$ 3,724
Defined Benefit Plan, Interest Cost			11,187	13,528	13,828
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)			(1,724)	(2,504)	(2,511)
Defined Benefit Plan, Amortization of Gains (Losses)			8,214	7,666	6,793
Defined Benefit Plan, Net Periodic Benefit Cost			21,240	25,157	28,979
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments			0	2,839	6,954
Defined Benefit Plan, Special Termination Benefits			0	300	191
United States Pension Plans of US Entity, Defined Benefit [Member] | Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost			18,939	19,450	23,157
Defined Benefit Plan, Interest Cost			81,040	87,738	89,602
Defined Benefit Plan, Expected Return on Plan Assets			121,623	123,058	123,095
Defined Benefit Plan, Amortization of Transition Obligations (Assets)			0	0	0
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)			803	147	(2,575)
Defined Benefit Plan, Amortization of Gains (Losses)			(52,957)	(37,522)	(32,343)
Defined Benefit Plan, Other Costs			0	1,489	8,148
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments			(48)	3,036	10,712
Defined Benefit Plan, Net Periodic Benefit Cost			32,068	26,324	38,292
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments			0	0
Defined Benefit Plan, Special Termination Benefits			0	1,489
Foreign Pension Plans, Defined Benefit [Member] | Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost		7,310	7,763	7,310	6,907
Defined Benefit Plan, Interest Cost		28,329	27,793	28,329	27,507
Defined Benefit Plan, Expected Return on Plan Assets		31,784	32,299		28,838
Defined Benefit Plan, Amortization of Transition Obligations (Assets)			(10)	(10)	(9)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)		170	112		214
Defined Benefit Plan, Amortization of Gains (Losses)		(11,135)	(14,103)		(10,205)
Defined Benefit Plan, Other Costs		277	601		291
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments		274	444		1,285
Defined Benefit Plan, Net Periodic Benefit Cost	15,701		18,507		17,562
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments			(10)	(9)
Defined Benefit Plan, Special Termination Benefits			$ 601	$ 277