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Short-term Investments (Tables)
 12 Months Ended
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