Pension and Other Post-Retirement Plans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Components of net periodic pension benefit cost
Service cost	$ 462	$ 471	$ 923	$ 943
Interest cost	1,173	1,237	2,347	2,473
Expected return on plan assets	(1,162)	(1,226)	(2,324)	(2,451)
Amortization of actuarial gains	95	140	189	280
Amortization of prior service costs	(3)	11	(5)	22
Net periodic cost	$ 565	$ 633	$ 1,130	$ 1,267
Maximum percentage of participant contributions eligible for Employer contribution match, towards defined contribution plan (as a percent)			6.00%
Employer's matching contribution on the dollar for the first 6 percent of participant contributions, effective January 1, 2010			37.5 cents
Percentage of employer's contribution under 401(k) plan matching up to 6 percent of participant contributions subject to maximum percentage of eligible compensation, effective from January 1, 2010(as a percent)			2.25%
U.K.-based union employees, U.K. Plan
Defined benefit plan disclosure
Number of years of employee's average compensation preceding retirement (in years)			2

Represents the amount of employer's matching contribution on the dollar for the first six percent of participant contributions.

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Represents the percentage of employer's contribution matching up to six percent of participant contributions subject to maximum percentage of eligible compensation.

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Represents the maximum percentage of participant contributions eligible for employer's matching contribution.

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- Definition

Number of years of employees' average compensation preceding retirement considered for computation of retirement benefits.

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- Definition

The amount of gains or losses recognized in net periodic benefit cost

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph h

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- Definition

The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph h

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 106
-Paragraph 518

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 87
-Paragraph 264

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph h

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- Definition

The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

+ References

+ Details

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- Definition

The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain or loss, prior service cost or credit, transition asset or obligation, and gain or loss due to settlements or curtailments).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph h

+ Details

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- Definition

The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

+ References

+ Details

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