Fair Value Measurements (Details Textual) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deferred acquisition consideration settled through issuance of shares	$ 4,153
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	0
Business Combination, Contingent Consideration, Liability	235,370		$ 229,564
Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Other Adjustments	0		(6,412)
Fixed payments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Business Combination, Contingent Consideration, Liability	4,300		$ 4,810
Common Stock [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deferred acquisition consideration settled through issuance of shares	$ 5,028
Stock Issued During Period, Shares, New Issues	568,182		691,559
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	$ 262
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures	17,000
Common Stock [Member] | Common Class A [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deferred acquisition consideration settled through issuance of shares		$ 0	$ 10,458
Share Capital To Be Issued [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Stock Authorized During Period, Value, To be Issued	$ (2,360)		2,360
Common Stock, Value, To be Issued	$ 0		$ 2,360
Stock Authorized During Period, Shares, To be Issued	(100,000)		100,000
Common Stock, Shares, To be Issued	0		100,000
Share Capital To Be Issued [Member] | Common Class A [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Common Stock, Value, To be Issued	$ 0		$ 2,360