Pension and Other Postretirement Benefits (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined benefit pension plans [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation, beginning balance	$ 496,316	$ 441,426
Service cost	6,181	6,530	5,923
Interest cost	20,112	21,624	22,452
Amendments	0	158
Actuarial loss	(40,703)	47,975
Benefits paid	(28,060)	(26,148)
Transfers in	6,786	2,588
Curtailment gain	(8,715)	0
Plan Settlement	0	(769)
Special termination benefit	1,016	0	0
Participant contributions	545	469
Foreign exchange rate changes	244	2,463
Benefit obligation, ending balance	453,722	496,316	441,426
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, beginning balance	387,553	340,370
Actual return on plan assets	80,979	46,913
Company contributions	5,984	22,417
Participant contributions	545	469
Benefits paid	(28,060)	(26,148)
Plan Settlements	0	(769)
Transfers in	6,627	2,086
Foreign exchange rate changes	(50)	2,215
Fair value of plan assets, ending balance	453,578	387,553	340,370
Funded/(underfunded) status, December 31	(144)	(108,763)
Defined benefit pension plans, U.S. [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation, beginning balance	423,547	377,982
Service cost	5,403	5,860
Interest cost	17,571	18,800
Amendments	0	158
Actuarial loss	(40,734)	43,155
Benefits paid	(23,348)	(22,408)
Transfers in	0	0
Curtailment gain	(8,715)	0
Plan Settlement	0	0
Special termination benefit	1,016	0
Participant contributions	0	0
Foreign exchange rate changes	0	0
Benefit obligation, ending balance	374,740	423,547
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, beginning balance	323,711	283,538
Actual return on plan assets	74,622	42,755
Company contributions	4,074	19,826
Participant contributions	0	0
Benefits paid	(23,348)	(22,408)
Plan Settlements	0	0
Transfers in	0
Foreign exchange rate changes	0	0
Fair value of plan assets, ending balance	379,059	323,711
Funded/(underfunded) status, December 31	4,319	(99,836)
Defined benefit pension plans, Non-U.S. [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation, beginning balance	72,769	63,444
Service cost	778	670
Interest cost	2,541	2,824
Amendments	0	0
Actuarial loss	31	4,820
Benefits paid	(4,712)	(3,740)
Transfers in	6,786	2,588
Curtailment gain	0	0
Plan Settlement	0	(769)
Special termination benefit	0	0
Participant contributions	545	469
Foreign exchange rate changes	244	2,463
Benefit obligation, ending balance	78,982	72,769
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, beginning balance	63,842	56,832
Actual return on plan assets	6,357	4,158
Company contributions	1,910	2,591
Participant contributions	545	469
Benefits paid	(4,712)	(3,740)
Plan Settlements	0	(769)
Transfers in	6,627	2,086
Foreign exchange rate changes	(50)	2,215
Fair value of plan assets, ending balance	74,519	63,842
Funded/(underfunded) status, December 31	(4,463)	(8,927)
Other postretirement benefit plans [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation, beginning balance	53,988	54,587
Service cost	233	273	286
Interest cost	2,061	2,532	2,831
Actuarial loss	(2,328)	745
Benefits paid	(9,133)	(6,922)
Curtailment gain	(1,675)	0
Special termination benefit	0	0	0
Participant contributions	3,039	2,782
Foreign exchange rate changes	58	(9)
Benefit obligation, ending balance	46,243	53,988	54,587
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, beginning balance	0	0
Company contributions	6,094	4,140
Participant contributions	3,039	2,782
Benefits paid	(9,133)	(6,922)
Fair value of plan assets, ending balance	0	0	0
Funded/(underfunded) status, December 31	$ 46,243	$ 53,988