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Fair Value Of Financial Instruments (Details) (USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Fair Value, Inputs, Level 3 [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 3 [Member]
Dec. 31, 2011
Fair Value, Inputs, Level 3 [Member]
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