Retirement Benefit Plans (Fair Value Hierarchy) (Details) - Defined Benefit Pension Plans - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of each major category of U.S. plan assets	$ 64,893	$ 68,675
Level 1 | U.S. equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of each major category of U.S. plan assets	33,799	37,969
Level 1 | Non-U.S. equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of each major category of U.S. plan assets	8,003	7,764
Level 1 | Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of each major category of U.S. plan assets	22,787	22,617
Level 1 | Money market
Defined Benefit Plan Disclosure [Line Items]
Fair value of each major category of U.S. plan assets	304	325
Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of each major category of U.S. plan assets	4,383	5,286
Level 2 | U.S. equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of each major category of U.S. plan assets	670	864
Level 2 | Non-U.S. equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of each major category of U.S. plan assets	1,939	2,326
Level 2 | Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of each major category of U.S. plan assets	1,774	2,096
Level 2 | Money market
Defined Benefit Plan Disclosure [Line Items]
Fair value of each major category of U.S. plan assets	$ 0	$ 0