Fair Value Measurements (Details Textual) - USD ($)	6 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deferred acquisition consideration settled through issuance of shares	$ 27,852,000
Business Combination, Contingent Consideration, Liability	169,680,000		$ 229,564,000
Fixed payments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Business Combination, Contingent Consideration, Liability	10,180,000		$ 4,810,000
Common Stock [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deferred acquisition consideration settled through issuance of shares	$ 28,727,000
Stock Issued During Period, Shares, New Issues	3,353,939		691,559
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		$ 5,585,000	$ 10,458,000
Share Capital To Be Issued [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Stock Authorized During Period, Value, To be Issued	$ (2,360,000)		$ 2,360,000
Stock Authorized During Period, Shares, To be Issued	100,000		100,000
Aggregate 2016 Step Up Transactions [Member] | Contingent payment [Domain]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Business Combination, Consideration Transferred			$ 4,052,000
Aggregate 2016 Step Up Transactions [Member] | Fixed payments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Business Combination, Consideration Transferred			$ 467