Retirement Benefit Plans (Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Loss)) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
U.S. Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Actuarial loss	$ 8,896	$ (11,503)	$ 3,131
Amortization of actuarial loss	(837)	(1,822)	(2,772)
Prior-service credit	360	(1,331)	0
Amortization of prior service (cost) credit	(32)	47	100
Curtailment gain	0	1,701	0
Total recognized in other comprehensive (income) loss	8,387	(12,908)	459
Non-U.S. Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Actuarial loss	(94)	(735)	45
Amortization of actuarial loss	(112)	(121)	(131)
Total recognized in other comprehensive (income) loss	(206)	(856)	(86)
Other Postretirement Benefit Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Actuarial loss	613	16	295
Amortization of actuarial loss	(66)	(52)	(40)
Amortization of prior service (cost) credit	107	107	156
Total recognized in other comprehensive (income) loss	$ 654	$ 71	$ 411