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Financial Instruments Measured at Fair Value Financial Instruments Measured at Fair Value Summary of Level 3 Details (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2012 | Dec. 31, 2011
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Business Acquisition, Contingent Consideration, at Fair Value | $ (14,850) |
Interest Accretion on Contignent Consideration | (181) |
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value | $ (15,031) | $ 0

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