Retirement Benefit Plans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
U.S. Pension and Postretirement Health Care
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 18	$ 20
Interest cost	794	780
Expected return on plan assets	(1,267)	(1,216)
Amortization of actuarial loss	244	601
Amortization of prior service credit	(19)	(45)
Total	(230)	140
Non-U.S. Pension
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	0	0
Interest cost	49	50
Expected return on plan assets	(74)	(72)
Amortization of prior service credit	16	30
Total	$ (9)	$ 8