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Significant Unobservable Inputs Used in Fair Value Measurements (Details) (Contingent Consideration Liabilities, Fair Value, Inputs, Level 3)
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Sep. 30, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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Contingent Consideration Liabilities | Fair Value, Inputs, Level 3
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| Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation | |||
| Weighted Average, Probability of achieving payout targets | 71.70% | 79.70% | 78.10% |
| Weighted Average, Discount rate | 6.50% | 6.60% | 3.00% |