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Fair Value Measurements (Details Textual) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2017	Jun. 30, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deferred acquisition consideration		$ 122,426	$ 83,707
Fixed payments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deferred acquisition consideration		$ 3,340	$ 1,343
Common Stock
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
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	$ 28,727

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Amount of liability recognized arising from contingent consideration in a business combination.

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