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Investments (Tables) | 12 Months Ended
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Dec. 31, 2014
Investments, All Other Investments [Abstract] |
Schedule of Cost and Equity Method Investments [Table Text Block] | The following table summarizes the Company's investments (dollars in thousands):
| December 31, 2014 |  | Percent Ownership of Voting Stock |  | December 31, 2013 |  | Percent Ownership of Voting Stock
Cost and equity method investments: |  |  |  |  |  |  |  |  |  |  |
Cost method investments | $ | 15,630 |  |  | 6 | % | to | 19 | % |  | $ | 15,788 |  |  | 6 | % | to | 19 | %
Equity method investments | 1,231 |  |  | 21 | % | to | 50 | % |  | 1,690 |  |  | 21 | % | to | 50 | %
Total cost and equity method investments | 16,861 |  |  |  |  | 17,478 |  |  |
Available-for-sale securities: |  |  |  |  |  |  |
Convertible debt securities | 2,527 |  |  |  |  | 3,174 |  |  |
Redeemable preferred shares | 4,910 |  |  | 17 | % | to | 19 | % |  | — |  |  | 19 | % |  |
Total available-for-sale securities | 7,437 |  |  |  |  | 3,174 |  |  |
Total investments | $ | 24,298 |  |  |  |  | $ | 20,652 |  |  |
Schedule of Available-for-sale Securities Reconciliation [Table Text Block] | 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 December 31, 2014 and 2013, respectively (in thousands):
| December 31, 2014 |  | December 31, 2013
| Amortized Cost |  | Gross Unrealized Gain |  | Gross Unrealized Loss |  | Fair Value |  | Amortized Cost |  | Gross Unrealized Gain |  | Gross Unrealized Loss |  | Fair Value
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible debt securities | $ | 2,030 |  |  | $ | 497 |  |  | $ | — |  |  | $ | 2,527 |  |  | $ | 3,370 |  |  | $ | — |  |  | $ | (196 | ) |  | $ | 3,174 |
Redeemable preferred shares | 4,599 |  |  | 311 |  |  | — |  |  | 4,910 |  |  | — |  |  | — |  |  | — |  |  | — |
Total available-for-sale securities | $ | 6,629 |  |  | $ | 808 |  |  | $ | — |  |  | $ | 7,437 |  |  | $ | 3,370 |  |  | $ | — |  |  | $ | (196 | ) |  | $ | 3,174 |

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- Definition Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value. + References No definition available. + Details
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