Postretirement Benefit Plans (Details 1) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
UNITED STATES [Member]
Schedule of amounts recognized in balance sheet
Current liability	$ (174)	$ (268)
Non-current liability	(32,195)	(34,631)
Net amount recognized	(32,369)	(34,899)
UNITED KINGDOM [Member]
Schedule of amounts recognized in balance sheet
Current liability
Non-current liability	(3,332)	(1,134)
Net amount recognized	$ (3,332)	$ (1,134)

For a classified balance sheet, the amount recognized in balance sheet as a current liability associated with an underfunded defined benefit plan.

+ References+ Details

This represents the entire liability recognized in the balance sheet that is associated with the defined benefit plans.

+ References

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

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+ Details

- Definition

This represents the noncurrent liability for underfunded plans recognized in the balance sheet that is associated with the defined benefit pension plans and other postretirement defined benefit plans.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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+ Details