Quarterly report pursuant to Section 13 or 15(d)

Derivative Contracts - Derivative Gains (Losses) (Details)

v3.19.1
Derivative Contracts - Derivative Gains (Losses) (Details) - Not Designated as Hedging Instrument - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative gain (loss) $ 415 $ 1,396
Common Stock options/warrants    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative gain (loss) 368 1,671
Forward contracts    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative gain (loss) $ 47 $ (275)