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Fair Value Measurements - Schedule of Changes to Deferred Acquisition Consideration (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability |  | $ 347,104,000 | $ 205,368,000 | $ 347,104,000 | $ 205,368,000 |
Payments Related To Acquisition |  |  |  | 134,056,000 | 78,322,000 | $ 119,572,000
Contingent Payment [Member] |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability |  | 41,910 | 1,751 | 36,344,000 | 16,467,000 | 35,914,000
Contingent Payment [Member] | Fair Value, Inputs, Level 3 |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability |  | $ 306,734,000 | $ 172,227,000 | 306,734,000 | 172,227,000 | $ 151,848,000
Payments Related To Acquisition |  |  |  | 77,301,000 | 61,441,000 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |
Business Combination, Consideration Transferred, Liabilities Incurred | [1] |  |  | 174,530,000 | 68,642,000 |
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability | [2] |  |  | 41,636,000 | 20,816,000 |
Transfers (to) from fixed payments |  |  |  | 0 | (5,146,000) |
Liabilities, Fair Value Adjustment |  |  |  | $ (4,358,000) | $ (2,492,000) |
[1] | .
[2] | .

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