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Commitments and Contingencies (Details Textual) (USD $)	1 Months Ended			12 Months Ended
Commitments and Contingencies (Details Textual) (USD $)	Jul. 31, 2010 Patent	Dec. 31, 2009 Respondent	Sep. 30, 2009 Respondent	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Commitments and Contingencies (Textual) [Abstract]
Purchase order outstanding				$ 6,938,000
Total annual rental expense				5,557,000	5,190,000	6,574,000
Total annual rental income				$ 791,000	$ 607,000	$ 645,000
Number of respondents with whom a settlement was reached		5	2
Number of the Company's patents found invalid	2

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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