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Accounting Policies (Details Textual) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013 States	Dec. 31, 2012
Accounting Policies [Abstract]
Deferred revenue	$ 17.0	$ 18.3
Number of operating states	17

The carrying amount of consideration received or receivable as of the balance sheet date on potential earnings that were not recognized as revenue in conformity with GAAP, and which are expected to be recognized as such within one year or the normal operating cycle, if longer, including sales, license fees, and royalties, but excluding interest income.

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