Retirement Benefit Plans (Net Periodic Pension Expense) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
U.S. Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Interest cost		$ 2,627	$ 2,754	$ 2,766
Expected return on plan assets		(4,892)	(4,689)	(4,513)
Amortization of actuarial loss		1,059	837	1,822
Amortization of prior service credit		50	32	(47)
Curtailment gain	$ 1,700	0	0	1,701
Net periodic pension benefit expense (income)		(1,156)	(1,066)	(1,673)
Non-U.S. Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Interest cost		152	196	197
Expected return on plan assets		(272)	(296)	(282)
Amortization of actuarial loss		146	112	121
Settlements		37	0	0
Net periodic pension benefit expense (income)		63	12	36
Other Postretirement Benefit Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Service cost		70	70	77
Interest cost		113	118	98
Amortization of actuarial loss		91	66	52
Amortization of prior service credit		(107)	(107)	(107)
Net periodic pension benefit expense (income)		$ 167	$ 147	$ 120