Pension and Postretirement Benefits other than Pensions (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
U.S. Pension Benefits [Member]
Components of net periodic benefit cost (income)
Service cost	$ 305	$ 287
Interest cost	3,052	3,476
Expected return on plan assets	(4,342)	(3,868)
Amortization of prior service cost (credit) and recognized actuarial (gain) loss	344	124
Net periodic benefit cost (gain)	(641)	19
Non-U.S. Pension Benefits [Member]
Components of net periodic benefit cost (income)
Service cost	888	803
Interest cost	1,710	1,972
Expected return on plan assets	(949)	(1,003)
Amortization of prior service cost (credit) and recognized actuarial (gain) loss	330	95
Net periodic benefit cost (gain)	1,979	1,867
U.S. Other Postretirement Benefits [Member]
Components of net periodic benefit cost (income)
Service cost	147	136
Interest cost	407	449
Amortization of prior service cost (credit) and recognized actuarial (gain) loss	(281)	(444)
Other	6	19
Curtailment gain		(1,539)
Net periodic benefit cost (gain)	279	(1,379)
Non-U.S. Other Postretirement Benefits [Member]
Components of net periodic benefit cost (income)
Service cost	168	192
Interest cost	188	210
Amortization of prior service cost (credit) and recognized actuarial (gain) loss	(36)	34
Other
Curtailment gain
Net periodic benefit cost (gain)	$ 320	$ 436