Pension and Postretirement Benefits other than Pensions (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
U.S. Pension Plans [Member]
Net periodic benefit cost of defined benefit plans and other postretirement benefit plans
Service cost	$ 287	$ 526	$ 861	$ 1,578
Interest cost	3,476	3,687	10,428	11,061
Amortization of prior service cost and recognized actuarial (gain) loss	124	5	372	15
Expected return on plan assets	(3,868)	(4,052)	(11,604)	(12,156)
Net periodic benefit cost	19	166	57	498
Non-U.S. Pension plans [Member]
Net periodic benefit cost of defined benefit plans and other postretirement benefit plans
Service cost	778	633	2,366	1,898
Interest cost	1,919	1,791	5,830	5,373
Amortization of prior service cost and recognized actuarial (gain) loss	96	10	284	32
Expected return on plan assets	(1,010)	(1,017)	(3,010)	(3,059)
Net periodic benefit cost	1,783	1,417	5,470	4,244
U.S. Other Postretirement Benefits [Member]
Net periodic benefit cost of defined benefit plans and other postretirement benefit plans
Service cost	136	299	408	897
Interest cost	449	751	1,347	2,253
Amortization of prior service cost and recognized actuarial (gain) loss	(444)	1	(1,332)	3
Curtailment gain			(1,539)
Other	19	21	57	63
Net periodic benefit cost	160	1,072	(1,059)	3,216
Non-U.S. Other Postretirement Benefits [Member]
Net periodic benefit cost of defined benefit plans and other postretirement benefit plans
Service cost	163	160	486	481
Interest cost	206	231	614	695
Amortization of prior service cost and recognized actuarial (gain) loss	(14)		(41)
Curtailment gain
Other
Net periodic benefit cost	$ 355	$ 391	$ 1,059	$ 1,176