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Summary of Significant Accounting Policies (Tables) | 3 Months Ended
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Mar. 31, 2019
Accounting Policies [Abstract] |
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] | Financial assets and liabilities measured at fair value on a recurring basis were as follows (in thousands):
| Level 1 |  | Level 2 |  | Level 3
Assets as of March 31, 2019: |  |  |  |  |
Trading securities - debt | $ | — |  |  | $ | 93,756 |  |  | $ | — |
Trading securities - equity | 831 |  |  | — |  |  | — |
Investment at fair value - warrants (Note 5) | — |  |  | 1,367 |  |  | — |
Investment at fair value - common stock (Note 5) | 4,116 |  |  | — |  |  | — |
Total recurring fair value measurements as of March 31, 2019 | $ | 4,947 |  |  | $ | 95,123 |  |  | $ | — |
Assets as of December 31, 2018: |  |  |  |  |
Trading securities - debt | $ | — |  |  | $ | 33,642 |  |  | $ | — |
Trading securities - equity | 3,012 |  |  | — |  |  | — |
Investment at fair value - warrants (Note 5) | — |  |  | 2,064 |  |  | — |
Investment at fair value - common stock (Note 5) | 5,395 |  |  | — |  |  | — |
Total recurring fair value measurements as of December 31, 2018 | $ | 8,407 |  |  | $ | 35,706 |  |  | $ | — |
Liabilities as of March 31, 2019: |  |  |  |  |
Profits interest units | $ | — |  |  | $ | 591 |  |  | $ | — |
Liabilities as of December 31, 2018: |  |  |  |  |
Profits interest units | $ | — |  |  | $ | 591 |  |  | $ | — |
Marketable Securities [Table Text Block] | Short-term investments for the periods presented were comprised of the following (in thousands):
| Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Security Type |  |  |  |  |  |  |
March 31, 2019: |  |  |  |  |  |  |
Trading securities - debt | $ | 93,464 |  |  | $ | 294 |  |  | $ | (2 | ) |  | $ | 93,756 |
Trading securities - equity | 829 |  |  | 8 |  |  | (6 | ) |  | 831 |
| $ | 94,293 |  |  | $ | 302 |  |  | $ | (8 | ) |  | $ | 94,587 |
December 31, 2018: |  |  |  |  |  |  |
Trading securities - debt | $ | 33,643 |  |  | $ | 18 |  |  | $ | (19 | ) |  | $ | 33,642 |
Trading securities - equity | 3,389 |  |  | 27 |  |  | (404 | ) |  | 3,012 |
| $ | 37,032 |  |  | $ | 45 |  |  | $ | (423 | ) |  | $ | 36,654 |

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- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References No definition available. + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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