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Fair Value Measurements (Details 2) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |
Additions | $ 36,000 | $ 0 | $ 274,500 | $ 0
Changes in fair value | (2,201) | 4,019 | 5,643 | 3,220
Payments | 0 | 0 | 0 | (5,000)
Fair Value, Measurements, Recurring |  |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |
Fair value, beginning of period | 461,800 | 275,100 | 215,500 | 280,900
Fair value, end of period | $ 495,600 | $ 279,100 | $ 495,600 | $ 279,100

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