Retirement Benefit Plans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
U.S. Pension and Postretirement Health Care
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 20	$ 20
Interest cost	780	877
Expected return on plan assets	(1,216)	(1,180)
Amortization of actuarial loss	601	680
Amortization of prior service credit	(45)	30
Total	140	427
Non-U.S. Pension
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	0	0
Interest cost	50	52
Expected return on plan assets	(72)	(71)
Amortization of prior service credit	30	32
Total	$ 8	$ 13