Retirement Benefit Plans Part 1 (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Total cost of benefit for U.S. and Non-U.S. Plans	$ 11,766		$ 11,192		$ 11,271
Maximum employer contribution to 401(k) Plan as a percentage of employee's compensation	3.00%
Minimum service period required to be eligible for profit sharing contribution to 401(k) plan (in years)	1
Expenses for 401(k) Plan	6,423		6,226		6,864
U.K. Pension Plan
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value at beginning of year	8,855		7,738
Purchases, sales, issuances and settlements, net	74		0
Net gain	601		739
Foreign currency	203		378
Fair value at end of year	9,733		8,855
U.S. and U.K. Pension Plans | Fair Value
Fair Value of Plan Assets by Investment Type
Fair value of plan assets	62,130		55,797
U.S. and U.K. Pension Plans | Level 1
Fair Value of Plan Assets by Investment Type
Fair value of plan assets	52,397		46,942
U.S. and U.K. Pension Plans | Level 2
Fair Value of Plan Assets by Investment Type
Fair value of plan assets	0		0
U.S. and U.K. Pension Plans | Level 3
Fair Value of Plan Assets by Investment Type
Fair value of plan assets	9,733		8,855
U.S. and U.K. Pension Plans | Cash and Cash Equivalents | Fair Value
Fair Value of Plan Assets by Investment Type
Fair value of plan assets	746		701
U.S. and U.K. Pension Plans | Cash and Cash Equivalents | Level 1
Fair Value of Plan Assets by Investment Type
Fair value of plan assets	746		701
U.S. and U.K. Pension Plans | Cash and Cash Equivalents | Level 2
Fair Value of Plan Assets by Investment Type
Fair value of plan assets	0		0
U.S. and U.K. Pension Plans | Cash and Cash Equivalents | Level 3
Fair Value of Plan Assets by Investment Type
Fair value of plan assets	0		0
U.S. and U.K. Pension Plans | Equity Securities - U.S. Small-Cap | Fair Value
Fair Value of Plan Assets by Investment Type
Fair value of plan assets			1,438
U.S. and U.K. Pension Plans | Equity Securities - U.S. Small-Cap | Level 1
Fair Value of Plan Assets by Investment Type
Fair value of plan assets			1,438
U.S. and U.K. Pension Plans | Equity Securities - U.S. Small-Cap | Level 2
Fair Value of Plan Assets by Investment Type
Fair value of plan assets			0
U.S. and U.K. Pension Plans | Equity Securities - U.S. Small-Cap | Level 3
Fair Value of Plan Assets by Investment Type
Fair value of plan assets			0
U.S. and U.K. Pension Plans | Equity Securities - U.S. Mid-Cap | Fair Value
Fair Value of Plan Assets by Investment Type
Fair value of plan assets			2,266
U.S. and U.K. Pension Plans | Equity Securities - U.S. Mid-Cap | Level 1
Fair Value of Plan Assets by Investment Type
Fair value of plan assets			2,266
U.S. and U.K. Pension Plans | Equity Securities - U.S. Mid-Cap | Level 2
Fair Value of Plan Assets by Investment Type
Fair value of plan assets			0
U.S. and U.K. Pension Plans | Equity Securities - U.S. Mid-Cap | Level 3
Fair Value of Plan Assets by Investment Type
Fair value of plan assets			0
U.S. and U.K. Pension Plans | Equity Securities - International Small-Cap | Fair Value
Fair Value of Plan Assets by Investment Type
Fair value of plan assets			63
U.S. and U.K. Pension Plans | Equity Securities - International Small-Cap | Level 1
Fair Value of Plan Assets by Investment Type
Fair value of plan assets			63
U.S. and U.K. Pension Plans | Equity Securities - International Small-Cap | Level 2
Fair Value of Plan Assets by Investment Type
Fair value of plan assets			0
U.S. and U.K. Pension Plans | Equity Securities - International Small-Cap | Level 3
Fair Value of Plan Assets by Investment Type
Fair value of plan assets			0
U.S. and U.K. Pension Plans | Mutual Funds - Corporate Bonds | Fair Value
Fair Value of Plan Assets by Investment Type
Fair value of plan assets			18,671
U.S. and U.K. Pension Plans | Mutual Funds - Corporate Bonds | Level 1
Fair Value of Plan Assets by Investment Type
Fair value of plan assets			18,671
U.S. and U.K. Pension Plans | Mutual Funds - Corporate Bonds | Level 2
Fair Value of Plan Assets by Investment Type
Fair value of plan assets			0
U.S. and U.K. Pension Plans | Mutual Funds - Corporate Bonds | Level 3
Fair Value of Plan Assets by Investment Type
Fair value of plan assets			0
U.S. and U.K. Pension Plans | Mutual Funds - U.S. Large-Cap | Fair Value
Fair Value of Plan Assets by Investment Type
Fair value of plan assets	20,597		18,141
U.S. and U.K. Pension Plans | Mutual Funds - U.S. Large-Cap | Level 1
Fair Value of Plan Assets by Investment Type
Fair value of plan assets	20,597		18,141
U.S. and U.K. Pension Plans | Mutual Funds - U.S. Large-Cap | Level 2
Fair Value of Plan Assets by Investment Type
Fair value of plan assets	0		0
U.S. and U.K. Pension Plans | Mutual Funds - U.S. Large-Cap | Level 3
Fair Value of Plan Assets by Investment Type
Fair value of plan assets	0		0
U.S. and U.K. Pension Plans | Mutual Funds International Large Cap | Fair Value
Fair Value of Plan Assets by Investment Type
Fair value of plan assets			5,662
U.S. and U.K. Pension Plans | Mutual Funds International Large Cap | Level 1
Fair Value of Plan Assets by Investment Type
Fair value of plan assets			5,662
U.S. and U.K. Pension Plans | Mutual Funds International Large Cap | Level 2
Fair Value of Plan Assets by Investment Type
Fair value of plan assets			0
U.S. and U.K. Pension Plans | Mutual Funds International Large Cap | Level 3
Fair Value of Plan Assets by Investment Type
Fair value of plan assets			0
U.S. and U.K. Pension Plans | Mutual Funds - U.S. Small-Cap | Fair Value
Fair Value of Plan Assets by Investment Type
Fair value of plan assets	6,971
U.S. and U.K. Pension Plans | Mutual Funds - U.S. Small-Cap | Level 1
Fair Value of Plan Assets by Investment Type
Fair value of plan assets	6,971
U.S. and U.K. Pension Plans | Mutual Funds - U.S. Small-Cap | Level 2
Fair Value of Plan Assets by Investment Type
Fair value of plan assets	0
U.S. and U.K. Pension Plans | Mutual Funds - U.S. Small-Cap | Level 3
Fair Value of Plan Assets by Investment Type
Fair value of plan assets	0
U.S. and U.K. Pension Plans | Mutual Funds - International Equities | Fair Value
Fair Value of Plan Assets by Investment Type
Fair value of plan assets	6,328
U.S. and U.K. Pension Plans | Mutual Funds - International Equities | Level 1
Fair Value of Plan Assets by Investment Type
Fair value of plan assets	6,328
U.S. and U.K. Pension Plans | Mutual Funds - International Equities | Level 2
Fair Value of Plan Assets by Investment Type
Fair value of plan assets	0
U.S. and U.K. Pension Plans | Mutual Funds - International Equities | Level 3
Fair Value of Plan Assets by Investment Type
Fair value of plan assets	0
U.S. and U.K. Pension Plans | Mutual Funds - Fixed-Income Domestic | Fair Value
Fair Value of Plan Assets by Investment Type
Fair value of plan assets	17,755
U.S. and U.K. Pension Plans | Mutual Funds - Fixed-Income Domestic | Level 1
Fair Value of Plan Assets by Investment Type
Fair value of plan assets	17,755
U.S. and U.K. Pension Plans | Mutual Funds - Fixed-Income Domestic | Level 2
Fair Value of Plan Assets by Investment Type
Fair value of plan assets	0
U.S. and U.K. Pension Plans | Mutual Funds - Fixed-Income Domestic | Level 3
Fair Value of Plan Assets by Investment Type
Fair value of plan assets	0
U.S. and U.K. Pension Plans | Investment Account Held By Pension Plan | Fair Value
Fair Value of Plan Assets by Investment Type
Fair value of plan assets	9,733	[1]	8,855	[1]
U.S. and U.K. Pension Plans | Investment Account Held By Pension Plan | Level 1
Fair Value of Plan Assets by Investment Type
Fair value of plan assets	0	[1]	0	[1]
U.S. and U.K. Pension Plans | Investment Account Held By Pension Plan | Level 2
Fair Value of Plan Assets by Investment Type
Fair value of plan assets	0	[1]	0	[1]
U.S. and U.K. Pension Plans | Investment Account Held By Pension Plan | Level 3
Fair Value of Plan Assets by Investment Type
Fair value of plan assets	$ 9,733	[1]	$ 8,855	[1]

[1] This category is comprised of investments in insurance contracts.