Amount of net periodic benefit cost expected to be recognized in next fiscal year.

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- Definition

Defined benefit plan asset maturity period.

+ References

No definition available.

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- Definition

Defined benefit plan assets interest rate description.

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- Definition

Defined benefit plan assumptions used calculating net periodic benefit cost expected long term return on assets next twelve months.

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- Definition

Maturity period of investment grade corporate bonds denominated in sterling.

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- Definition

Maturity period of investments in UK government index-linked securities.

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- Definition

Number of new participants added.

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- Definition

Period of employee salary used to calculate benefits under plan.

+ References

No definition available.

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- Definition

Subsidiaries defined benefit plan represents specified maximum percentage of company's aggregate pension plan liabilities.

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No definition available.

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- Definition

Subsidiaries defined benefit plan represents specified percentage of company's aggregate pension plan liabilities.

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- Definition

The interest rate used to adjust for the time value of money for the plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

-Subparagraph j

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (k)(1)

-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920

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- Definition

Expected rate of compensation increases (for pay-related plans).

+ References

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- Definition

An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (k)(3)

-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 87

-Paragraph 264

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

-Subparagraph j

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 30

-Glossary Expected Long-Term Rate of Return on Plan Assets

-URI http://asc.fasb.org/extlink&oid=6512013

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- Definition

1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Accumulated Postretirement Benefit Obligation

-URI http://asc.fasb.org/extlink&oid=6503904

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-Paragraph 6

-Subparagraph a

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-Publisher FASB

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-Paragraph 5

-Subparagraph a

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-Number 132R

-Paragraph E1

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-Publisher FASB

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Projected Benefit Obligation

-URI http://asc.fasb.org/extlink&oid=6522206

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- Definition

The increase in the fair value of plan assets from contributions made by the employer.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

-Subparagraph b

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)(3)

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- Definition

Target allocation of investments of this type to total plan assets presented on a weighted average basis.

+ References

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Target allocation maximum percentage of investments of this type to total plan assets presented on a weighted average basis.

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- Definition

Target allocation minimum percentage of investments of this type to total plan assets presented on a weighted average basis.

+ References

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- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

+ References

No definition available.

+ Details

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- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

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- Definition

Maximum percentage of employee gross pay, by the terms of the plan, that the employer may contribute to a defined contribution plan.

+ References

No definition available.

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- Definition

This element represents [net] transfers in to and out of assets measured at fair value on a recurring basis using unobservable inputs (Level 3) which have taken place during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 157

-Paragraph 32

-Subparagraph c(3)

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Retirement Plans (Details Textual) (USD $)	12 Months Ended
Retirement Plans (Details Textual) (USD $)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Retirement Plans (Textual) [Abstract]
Expected long-term rate of return on next year	5.70%
Expected long-term rate of return	5.30%	6.30%
Accumulated benefit obligation for the U.K. Plan	$ 85,058,000	$ 72,499,000	$ 67,165,000
Target asset allocations	100.00%	100.00%
Retirement Plans (Additional Textual) [Abstract]
Company contributions to this plan	1,431,000	1,343,000	1,200,000
Norwegian Plan description	Norwegian Plan represents less than three percent of both the Company's total pension plan liabilities and total pension plan assets
Norwegian Plan represents percentage of company's total pension plan liabilities	3.00%
Current expected contribution level	1,100,000
Discount rate assumption used to determine end of year benefit obligations	4.30%	5.00%
Compensation increase rate	2.70%	3.40%
Components of net periodic benefit cost	1,300,000
Transfers related to the Company's Level 3	0	0
Diversified Growth Fund [Member]
Retirement Plans (Textual) [Abstract]
Return on investments in diversified portfolio of equity, bonds, alternatives and cash markets	Libor GBP 3 month +3% Index
UK Government Fixed Income Securities [Member]
Retirement Plans (Textual) [Abstract]
Maturity period on investments in U.K. government fixed income securities (gilts)	25 years
Corporate Bonds [Member]
Retirement Plans (Textual) [Abstract]
Maturity period of investment grade corporate bonds denominated in sterling	15 years
UK Government Index-linked Securities [Member]
Retirement Plans (Textual) [Abstract]
Maturity period of investments in U.K. government index-linked securities (index-linked gilts)	P5Y
Equity securities [Member]
Retirement Plans (Textual) [Abstract]
Target asset allocations	40.00%	40.00%
Target asset allocations, minimum	37.00%
Target asset allocations, maximum	43.00%
Debt securities [Member]
Retirement Plans (Textual) [Abstract]
Target asset allocations	40.00%	40.00%
Target asset allocations, minimum	37.00%
Target asset allocations, maximum	43.00%
Equity and debt securities [Member]
Retirement Plans (Textual) [Abstract]
Target asset allocations	20.00%	20.00%
Target asset allocations, minimum	17.00%
Target asset allocations, maximum	25.00%
Maximum [Member]
Retirement Plans (Textual) [Abstract]
Employer's maximum contribution of pay	12.00%
UK Defined Benefit Plan [Member]
Retirement Plans (Textual) [Abstract]
Period of employee salary used to calculate benefits under plan	3 years
Accumulated benefit obligation for the U.K. Plan	$ 78,700,000	$ 64,400,000
Number of new participants added since the plan was frozen in 1994	0
UK Defined Benefit Plan [Member] \| Maximum [Member]
Retirement Plans (Textual) [Abstract]
Employee's contribution of pay	12.00%
UK Defined Benefit Plan [Member] \| Minimum [Member]
Retirement Plans (Textual) [Abstract]
Employee's contribution of pay	6.50%
Equity [Member]
Retirement Plans (Textual) [Abstract]
Expected long-term rate of return	7.00%
Bonds [Member]
Retirement Plans (Textual) [Abstract]
Expected long-term rate of return	3.70%