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Investments (Tables) | 9 Months Ended
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Sep. 30, 2017
Investments, All Other Investments [Abstract] |
Schedule of Cost and Equity Method Investments | The following table summarizes the Company's investments (dollars in thousands):
| September 30, 2017 |  | Percent Ownership of Voting Stock |  | December 31, 2016 |  | Percent Ownership of Voting Stock
Available-for-sale securities: |  |  |  |  |  |  |
Convertible debt securities | $ | 11,232 |  |  |  |  | $ | 10,038 |  |  |
Redeemable preferred shares | 15,552 |  |  | 19% | to | 25% |  | 17,444 |  |  | 19% | to | 25%
Total available-for-sale securities | 26,784 |  |  |  |  | 27,482 |  |  |
Cost method investments | 25,236 |  |  | 1% | to | 19% |  | 31,816 |  |  | 1% | to | 19%
Fair value option investments | 77,484 |  |  | 10% | to | 24% |  | 82,584 |  |  | 41% |  |
Total investments | $ | 129,504 |  |  |  |  | $ | 141,882 |  |  |
Schedule of Available-for-sale Securities Reconciliation | The following table summarizes the amortized cost, gross unrealized gain, gross unrealized loss and fair value of the Company's available-for-sale securities as of September 30, 2017 and December 31, 2016, respectively (in thousands):
| September 30, 2017 |  | December 31, 2016
| Amortized Cost |  | Gross Unrealized Gain |  | Gross Unrealized Loss (1) |  | Fair Value |  | Amortized Cost |  | Gross Unrealized Gain |  | Gross Unrealized Loss (1) |  | Fair Value
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible debt securities | $ | 10,009 |  |  | $ | 1,333 |  |  | $ | (110 | ) |  | $ | 11,232 |  |  | $ | 8,453 |  |  | $ | 1,691 |  |  | $ | (106 | ) |  | $ | 10,038 |
Redeemable preferred shares | 18,375 |  |  | — |  |  | (2,823 | ) |  | 15,552 |  |  | 18,375 |  |  | — |  |  | (931 | ) |  | 17,444 |
Total available-for-sale securities | $ | 28,384 |  |  | $ | 1,333 |  |  | $ | (2,933 | ) |  | $ | 26,784 |  |  | $ | 26,828 |  |  | $ | 1,691 |  |  | $ | (1,037 | ) |  | $ | 27,482 |
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