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Postretirement Benefit Plans (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
UNITED STATES [Member]
Schedule of amounts recognized in accumulated other comprehensive income
Net actuarial loss	$ 50,450	$ 49,401
UNITED KINGDOM [Member]
Schedule of amounts recognized in accumulated other comprehensive income
Net actuarial loss	$ 5,699	$ 2,637

The pretax total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

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