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Fair Value Measurements (Details Textual) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2016 | Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures | $ 0 |
Business Combination, Contingent Consideration, Liability | 320,973 | $ 347,104
Fixed payments [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Business Combination, Contingent Consideration, Liability | 10,040 | $ 40,370
Common Stock [Member] | Common Class A [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Stock Issued During Period, Value, New Issues | $ 5,368 |
Stock Issued During Period, Shares, New Issues | 227,437 |
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures | $ 956 |
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures | 79,278 |
Contingent Consideration, Liability Settlements [Domain] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Stock Issued During Period, Value, New Issues | $ 5,368 |

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- Definition Amount of liability recognized arising from contingent consideration in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 35 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 + Details
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