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

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