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Fair Value Measurements (Details 1) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Business Combination, Contingent Consideration, Liability | $ 94,729,000 | $ 122,426,000
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance of contingent payments | 119,086,000 | 224,754,000
Payments | 54,947,000 | 110,234,000
Additions | 12,816,000 | 0
Redemption value adjustments | 16,276,000 | 3,273,000
Foreign translation adjustment | (22,000) | 1,293,000
Ending balance of contingent payments | 93,209,000 | 119,086,000
Fixed payments [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Business Combination, Contingent Consideration, Liability | $ 1,520,000 | 3,340,000
Common Class A [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Restricted stock grant date fair value |  | $ 3,353,939

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