Pension and Other Postretirement Benefits (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Defined benefit pension plans [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation, beginning balance	$ 441,426	$ 414,973
Service cost	6,530	5,923	6,155
Interest cost	21,624	22,452	22,943
Amendments	158	117
Actuarial loss	47,975	34,309
Benefits paid	(26,148)	(26,791)
Transfers in	2,588	951
Curtailment gain	0	2,106
Plan Settlement	(769)	(7,757)
Participant contributions	469	598
Foreign exchange rate changes	2,463	(1,243)
Benefit obligation, ending balance	496,316	441,426	414,973
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, beginning balance	340,370	357,893
Actual return on plan assets	46,913	(3,980)
Company contributions	22,417	17,480
Participant contributions	469	598
Benefits paid	(26,148)	(26,791)
Plan Settlements	(769)	5,131
Transfers in	2,086	951
Foreign exchange rate changes	2,215	(650)
Fair value of plan assets, ending balance	387,553	340,370	357,893
Underfunded status, December 31	(108,763)	(101,056)
Defined benefit pension plans, U.S. [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation, beginning balance	377,982	343,425
Service cost	5,860	4,794
Interest cost	18,800	18,906
Amendments	158	117
Actuarial loss	43,155	33,078
Benefits paid	(22,408)	(22,338)
Transfers in	0	0
Curtailment gain	0	0
Plan Settlement	0	0
Participant contributions	0	0
Foreign exchange rate changes	0	0
Benefit obligation, ending balance	423,547	377,982
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, beginning balance	283,538	298,910
Actual return on plan assets	42,755	(5,808)
Company contributions	19,826	12,774
Participant contributions	0	0
Benefits paid	(22,408)	(22,338)
Plan Settlements	0	0
Transfers in	0
Foreign exchange rate changes	0	0
Fair value of plan assets, ending balance	323,711	283,538
Underfunded status, December 31	(99,836)	(94,444)
Defined benefit pension plans, Non-U.S. [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation, beginning balance	63,444	71,548
Service cost	670	1,129
Interest cost	2,824	3,546
Amendments	0	0
Actuarial loss	4,820	1,231
Benefits paid	(3,740)	(4,453)
Transfers in	2,588	951
Curtailment gain	0	2,106
Plan Settlement	(769)	(7,757)
Participant contributions	469	598
Foreign exchange rate changes	2,463	(1,243)
Benefit obligation, ending balance	72,769	63,444
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, beginning balance	56,832	58,983
Actual return on plan assets	4,158	1,828
Company contributions	2,591	4,706
Participant contributions	469	598
Benefits paid	(3,740)	(4,453)
Plan Settlements	769	5,131
Transfers in	2,086	951
Foreign exchange rate changes	2,215	(650)
Fair value of plan assets, ending balance	63,842	56,832
Underfunded status, December 31	(8,927)	(6,612)
Other postretirement benefit plans [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation, beginning balance	54,587	55,188
Service cost	273	286	357
Interest cost	2,532	2,831	3,182
Amendments	0	(2,376)
Actuarial loss	745	5,728
Benefits paid	(6,922)	(9,734)
Curtailment gain	0	0
Participant contributions	2,782	2,679
Foreign exchange rate changes	(9)	(15)
Benefit obligation, ending balance	53,988	54,587	55,188
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, beginning balance	0	0
Company contributions	4,140	7,055
Participant contributions	2,782	2,679
Benefits paid	(6,922)	(9,734)
Fair value of plan assets, ending balance	0	0	0
Underfunded status, December 31	$ 53,988	$ 54,587