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Fair Value Measurements (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Deferred acquisition consideration | $ 123,731 |  | $ 122,426
Fixed payments |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Deferred acquisition consideration | 1,881 |  | $ 3,340
Common Stock |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Deferred acquisition consideration settled through issuance of shares | $ 0 | $ 5,028 |
Stock issued during period (shares) |  |  | 3,353,939
Common Stock | Common Class A |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Deferred acquisition consideration settled through issuance of shares |  |  | $ 28,727

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