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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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Mar. 31, 2014
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Dec. 31, 2013
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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 | 96.40% | 70.60% |
| Weighted Average, Discount rate | 6.70% | 6.50% |