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Condensed Financial Information (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Revenue Recognized Under Net Reporting Arrangements	$ 20,944	$ 24,276
Provision for Doubtful Accounts	$ 1,156

Amount of the current period expense charged against operations, the offset which is generally to the allowance for doubtful accounts for the purpose of reducing receivables, including notes receivable, to an amount that approximates their net realizable value (the amount expected to be collected).

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