Fair Value Of Financial Instruments (Details) (USD $)
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3 Months Ended | ||||
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Mar. 31, 2013
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Mar. 31, 2012
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Mar. 31, 2013
Fair Value, Inputs, Level 3 [Member]
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Dec. 31, 2012
Fair Value, Inputs, Level 3 [Member]
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Dec. 31, 2011
Fair Value, Inputs, Level 3 [Member]
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Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] | |||||
Business Acquisition, Contingent Consideration, Potential Cash Payment | $ 4,256,000 | $ 4,256,000 | $ 9,478,000 | ||
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 | 0 | 0 | |||
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings | 0 | ||||
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability | $ 0 | $ 0 |