Retirement Benefit Plans (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Increase projected benefit obligation		$ 1,300	$ 5,000
Defined contribution plan, total costs		6,500	7,600	$ 8,000
Other Postretirement Benefit Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Increase projected benefit obligation		(226)	(613)
Actuarial loss included in accumulated other comprehensive income (loss) expected to be recognized in net periodic benefit cost, before tax		100
Actuarial loss included in accumulated other comprehensive income (loss) expected to be recognized in net periodic benefit cost, net of tax		100
Prior service cost (credit) included in accumulated other comprehensive income (loss) expected to be recognized in net periodic benefit cost, before tax		(100)
Prior service cost (credit) included in accumulated other comprehensive income (loss) expected to be recognized in net periodic benefit cost, net of tax		(100)
U.S. Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Curtailment gain	$ (1,700)	0	0	$ (1,701)
Increase projected benefit obligation		2,884	(8,736)
Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Actuarial loss included in accumulated other comprehensive income (loss) expected to be recognized in net periodic benefit cost, before tax		900
Actuarial loss included in accumulated other comprehensive income (loss) expected to be recognized in net periodic benefit cost, net of tax		600
Prior service cost (credit) included in accumulated other comprehensive income (loss) expected to be recognized in net periodic benefit cost, before tax		100
Non-U.S. Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Expected pension contributions, next fiscal year		100
Increase projected benefit obligation		$ 146	$ (301)