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Fair Value Measurements - Textual (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Stock Issued During Period, Shares, New Issues | 0 | 0 | 0
Fixed Payment [Member] |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Business Combination, Contingent Consideration, Liability | $ 4,810 | $ 40,370 |
Contingent and fixed payments [Member] |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Business Combination, Contingent Consideration, Liability | 229,564 | 347,104 |
Common Class A | Common Stock [Member] |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Stock Issued During Period, Value, New Issues | $ 10,458 | $ 0 | $ 0
Stock Issued During Period, Shares, New Issues | 691,559 |  |

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