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Short-term Investments (Tables) | 12 Months Ended
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Dec. 31, 2018
Short-term Investments [Abstract] |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] | A reconciliation of the activity for fair value measurements categorized within Level 3 for the year ended December 31, 2018 is as follows (in thousands):
| Investment at Fair Value |  | Other Liabilities
| Common Stock |  | Warrants |  | Total |  | Profits Interest Units
Opening balance as of January 1, 2018 | $ | 90,795 |  |  | $ | 13,959 |  |  | $ | 104,754 |  |  | $ | 3,041 |
Total gains and losses included in earnings for the period(1) |  |  |  |  |  |  |
Non-cash stock compensation expense - Profits Interests | — |  |  | — |  |  | — |  |  | (2,450 | )
Change in fair value of investment, net | (47,208 | ) |  | (11,895 | ) |  | (59,103 | ) |  | — |
Realized loss on sale | (19,095 | ) |  | — |  |  | (19,095 | ) |  | — |
Purchases, issues, sales and settlements | (19,097 | ) |  | — |  |  | (19,097 | ) |  | — |
Transfers to Level 1 and Level 2 | (5,395 | ) |  | (2,064 | ) |  | (7,459 | ) |  | (591 | )
Total recurring fair value measurements(1) | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Short-term Investments | for the periods presented were comprised of the following (in thousands):
| December 31, 2018
Security Type | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
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 the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19279-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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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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