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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

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