Retirement Benefit Plans (Obligation and Funded Status) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Change in benefit obligation
Actuarial (gain) loss	$ (5,000,000)
Amounts recognized in the balance sheets consist of:
Noncurrent liabilities	(10,616,000)	(7,648,000)
U.S. Pension Plan
Change in benefit obligation
Benefit obligation at beginning of year	65,099,000	72,977,000
Interest cost	2,754,000	2,766,000	3,056,000
Actuarial (gain) loss	8,736,000	(4,488,000)
Benefits paid	(4,262,000)	(4,715,000)
Plan amendments	0	(1,441,000)
Foreign currency exchange rate changes	0	0
Intercompany transfers	512,000	0
Benefit obligation at end of year	72,839,000	65,099,000	72,977,000
Accumulated benefit obligation at end of year	72,839,000	65,099,000
Change in plan assets
Fair value of plan assets at beginning of year	67,170,000	60,012,000
Actual return on plan assets	5,972,000	11,383,000
Employer contributions	496,000	490,000
Benefits paid	(4,262,000)	(4,715,000)
Foreign currency exchange rate changes	0	0
Intercompany transfers	(701,000)	0
Fair value of plan assets at end of year	68,675,000	67,170,000	60,012,000
Funded status at end of year	(4,164,000)	2,071,000
Amounts recognized in the balance sheets consist of:
Noncurrent assets	4,304,000	8,005,000
Current liabilities	(1,110,000)	(1,138,000)
Noncurrent liabilities	(7,358,000)	(4,796,000)
Amount recognized in the balance sheets	(4,164,000)	2,071,000
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), after Tax [Abstract]
Actuarial loss	26,925,000	18,861,000
Prior service credit	955,000	626,000
Deferred taxes	(10,683,000)	(7,854,000)
Currency differences and other	0	0
Accumulated other comprehensive income (loss)	17,197,000	11,633,000
Non-U.S. Pension Plan
Change in benefit obligation
Benefit obligation at beginning of year	4,603,000	5,212,000
Interest cost	196,000	197,000	208,000
Actuarial (gain) loss	301,000	(317,000)
Benefits paid	(151,000)	(160,000)
Plan amendments	0	0
Foreign currency exchange rate changes	(400,000)	(329,000)
Intercompany transfers	0	0
Benefit obligation at end of year	4,549,000	4,603,000	5,212,000
Accumulated benefit obligation at end of year	4,549,000	4,603,000
Change in plan assets
Fair value of plan assets at beginning of year	5,186,000	4,961,000
Actual return on plan assets	690,000	719,000
Employer contributions	20,000	0
Benefits paid	(151,000)	(160,000)
Foreign currency exchange rate changes	(459,000)	(334,000)
Intercompany transfers	0	0
Fair value of plan assets at end of year	5,286,000	5,186,000	4,961,000
Funded status at end of year	737,000	583,000
Amounts recognized in the balance sheets consist of:
Noncurrent assets	737,000	583,000
Current liabilities	0	0
Noncurrent liabilities	0	0
Amount recognized in the balance sheets	737,000	583,000
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), after Tax [Abstract]
Actuarial loss	1,110,000	1,380,000
Prior service credit	0	0
Deferred taxes	(426,000)	(576,000)
Currency differences and other	(43,000)	0
Accumulated other comprehensive income (loss)	641,000	804,000
Other Postretirement Benefit Plans, Defined Benefit
Change in benefit obligation
Benefit obligation at beginning of year	3,109,000	3,283,000
Service cost	70,000	77,000	79,000
Interest cost	118,000	98,000	120,000
Actuarial (gain) loss	613,000	16,000
Benefits paid	(376,000)	(365,000)
Benefit obligation at end of year	3,534,000	3,109,000	3,283,000
Change in plan assets
Benefits paid	(376,000)	(365,000)
Funded status at end of year	(3,534,000)	(3,109,000)
Amounts recognized in the balance sheets consist of:
Current liabilities	(276,000)	(257,000)
Noncurrent liabilities	(3,258,000)	(2,852,000)
Amount recognized in the balance sheets	(3,534,000)	(3,109,000)
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), after Tax [Abstract]
Actuarial loss	1,005,000	457,000
Prior service credit	(309,000)	(415,000)
Deferred taxes	475,000	674,000
Accumulated other comprehensive income (loss)	1,171,000	716,000
Amounts that will be amortized from accumulated other comprehensive income (loss) in next fiscal year
Actuarial loss included in accumulated other comprehensive income (loss) expected to be recognized in net periodic benefit cost in 2014, before tax	100,000
Actuarial loss included in accumulated other comprehensive income (loss) expected to be recognized in net periodic benefit cost in 2014, net of tax (less than $0.1 million)	100,000
Prior service cost (credit) included in accumulated other comprehensive income (loss) expected to be recognized in net periodic benefit cost in 2014, before tax (less than $0.1 million)	(100,000)
Prior service cost (credit) included in accumulated other comprehensive income (loss) expected to be recognized in net periodic benefit cost in 2014, net of tax (less than $0.1 million)	(100,000)
Defined Benefit Pension Plans
Amounts that will be amortized from accumulated other comprehensive income (loss) in next fiscal year
Actuarial loss included in accumulated other comprehensive income (loss) expected to be recognized in net periodic benefit cost in 2014, before tax	1,100,000
Actuarial loss included in accumulated other comprehensive income (loss) expected to be recognized in net periodic benefit cost in 2014, net of tax (less than $0.1 million)	600,000
Prior service cost (credit) included in accumulated other comprehensive income (loss) expected to be recognized in net periodic benefit cost in 2014, before tax (less than $0.1 million)	$ 100,000