Retirement Benefit Plans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
U.S. Pension and Postretirement Health Care
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 18	$ 19	$ 38	$ 39
Interest cost	686	769	1,466	1,646
Expected return on plan assets	(1,087)	(1,055)	(2,303)	(2,235)
Amortization of actuarial loss	651	773	1,252	1,453
Amortization of prior service credit	(55)	(156)	(100)	(126)
Total	213	350	353	777
Non-U.S. Pension
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	0	0	0	0
Interest cost	51	51	101	103
Expected return on plan assets	(71)	(71)	(143)	(142)
Amortization of prior service credit	31	33	61	65
Total	$ 11	$ 13	$ 19	$ 26