Acquisitions, Investments, and Licenses - Schedule of Net Gains and Losses on Equity Securities (Details) $ in Thousands |
12 Months Ended |
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Dec. 31, 2018
USD ($)
| |
Business Combinations [Abstract] | |
Net gains and losses recognized during the period on equity securities | $ 2,752 |
Less: Net gains and losses recognized during the period on equity securities sold during the period | 113 |
Unrealized net gains recognized during the reporting period on equity securities still held at the reporting date | $ 2,865 |