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Fair Value Measurements Fair Value, Reconciliation of Level 3 - Liabilities (Details) (USD $)
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3 Months Ended | 6 Months Ended | ||||||||||
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Jun. 30, 2014
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Jun. 30, 2013
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Jun. 30, 2014
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Jun. 30, 2013
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| Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] | ||||||||||||
| Business Combination, Contingent Consideration Arrangements, Change in Range of Outcomes, Contingent Consideration, Liability, Value, High | $ 7,300,000 | |||||||||||
| Contingent Consideration, Beginning Value | 0 | 7,699,000 | 606,000 | 7,601,000 | ||||||||
| Contingent Consideration, Issuances | 4,006,000 | 0 | 4,006,000 | 30,000 | ||||||||
| Contingent Consideration, Settlements | 0 | (30,000) | (424,000) | (30,000) | ||||||||
| Contingent Consideration, Reclass | 0 | 0 | (143,000) | 0 | ||||||||
| (Gain) loss, net from changes in fair value of contingent consideration | 0 | [1] | (815,000) | [1] | (39,000) | [1] | (747,000) | [1] | ||||
| Contingent Consideration, Ending Value | 4,006,000 | 6,854,000 | 4,006,000 | 6,854,000 | ||||||||
| Contingent Consideration, Unrealized Gain Loss | $ 0 | [2] | $ (815,000) | [2] | $ 0 | [2] | $ (747,000) | [2] | ||||
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