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Commitments and Contingencies (Details Textual) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Commitments and Contingencies (Textual) [Abstract]
Operating Leases, Rent Expense	$ 7.5	$ 7.3	$ 6.7
Future Lease Payments	2.6	2.9
Royalty Expense	2.4	3.3	2.6
Non-cancelable purchase commitments	$ 32.5

The floor amount as of the balance sheet date that the entity must expend to satisfy the terms of disclosed arrangements (excluding long-term commitments) in which the entity has agreed to expend funds to procure goods or services from one or more suppliers, other than under a long-term purchase commitment or an unconditional purchase obligation.

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