Retirement Benefits (Details 1) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Amounts recognized in consolidated balance sheets
Accrued pension liability	$ 23,674	$ 21,488
Accumulated loss	(7,523)	(5,298)
Net amount recognized	$ 16,151	$ 16,190
Assumptions used to determine pension obligations are as follows:
Discount rate	3.55%	4.48%
Rate of compensation increase

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

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- Definition

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

+ References

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