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Postretirement Benefit Plans (Details 6) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
UNITED STATES [Member]
Estimated amounts amortized from accumulated other comprehensive income into net periodic benefit cost
Net actuarial loss	$ 5,222
UNITED KINGDOM [Member]
Estimated amounts amortized from accumulated other comprehensive income into net periodic benefit cost
Net actuarial loss	$ 299

The aggregate amount in accumulated other comprehensive income expected to be recognized as a component of net periodic benefit cost over the fiscal year that follows the most recent annual statement of financial position presented, including the net gain (loss), net prior service cost or credit, and net transition asset or obligation.

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