Pension and Other Postretirement Benefits (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Defined benefit pension plans [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation, beginning balance	$ 414,973	$ 388,386
Service cost	5,923	6,155	6,598
Interest cost	22,452	22,943	22,734
Amendments	117	2,328
Actuarial loss	34,309	20,173
Benefits paid	(26,791)	(26,889)
Transfers in	951	1,262
Curtailment gain	(2,106)
Plan Settlement	(7,757)	0
Participant contributions	598	423
Foreign exchange rate changes	(1,243)	192
Benefit obligation, ending balance	441,426	414,973	388,386
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, beginning balance	357,893	325,356
Actual return on plan assets	(3,980)	45,333
Company contributions	17,480	11,472
Participant contributions	598	423
Benefits paid	(26,791)	(26,889)
Plan Settlements	(5,131)
Transfers in	951	1,262
Foreign exchange rate changes	(650)	936
Fair value of plan assets, ending balance	340,370	357,893	325,356
Underfunded status, December 31	(101,056)	(57,080)
Defined benefit pension plans, U.S. [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation, beginning balance	343,425	323,347
Service cost	4,794	5,172
Interest cost	18,906	19,494
Amendments	117	1,656
Actuarial loss	33,078	16,194
Benefits paid	(22,338)	(22,438)
Transfers in	0	0
Plan Settlement	0	0
Participant contributions	0	0
Foreign exchange rate changes	0	0
Benefit obligation, ending balance	377,982	343,425
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, beginning balance	298,910	272,540
Actual return on plan assets	(5,808)	40,092
Company contributions	12,774	8,716
Participant contributions	0	0
Benefits paid	(22,338)	(22,438)
Transfers in		0
Foreign exchange rate changes	0	0
Fair value of plan assets, ending balance	283,538	298,910
Underfunded status, December 31	(94,444)	(44,515)
Defined benefit pension plans, Non-U.S. [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation, beginning balance	71,548	65,039
Service cost	1,129	983
Interest cost	3,546	3,449
Amendments	0	672
Actuarial loss	1,231	3,979
Benefits paid	(4,453)	(4,451)
Transfers in	951	1,262
Curtailment gain	2,106
Plan Settlement	(7,757)	0
Participant contributions	598	423
Foreign exchange rate changes	(1,243)	192
Benefit obligation, ending balance	63,444	71,548
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, beginning balance	58,983	52,816
Actual return on plan assets	1,828	5,241
Company contributions	4,706	2,756
Participant contributions	598	423
Benefits paid	(4,453)	(4,451)
Plan Settlements	5,131
Transfers in	951	1,262
Foreign exchange rate changes	(650)	936
Fair value of plan assets, ending balance	56,832	58,983
Underfunded status, December 31	(6,612)	(12,565)
Other postretirement benefit plans [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation, beginning balance	55,188	54,811
Service cost	286	357	465
Interest cost	2,831	3,182	3,530
Amendments	(2,376)	0
Actuarial loss	5,728	2,500
Benefits paid	(9,734)	(6,693)
Curtailment gain	0	(950)
Participant contributions	2,679	1,846
Foreign exchange rate changes	(15)	135
Benefit obligation, ending balance	54,587	55,188	54,811
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, beginning balance	0	0
Company contributions	7,055	4,847
Participant contributions	2,679	1,846
Benefits paid	(9,734)	(6,693)
Fair value of plan assets, ending balance	0	0	0
Underfunded status, December 31	$ 54,587	$ 55,188