Quarterly report pursuant to Section 13 or 15(d)

Derivative Contracts - Derivative Gains (Losses) (Details)

v3.10.0.1
Derivative Contracts - Derivative Gains (Losses) (Details) - Not Designated as Hedging Instrument - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative gain (loss) $ 2,248 $ 5,482 $ 3,644 $ 9,519
Common Stock options/warrants        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative gain (loss) 1,916 444 3,587 (512)
Notes        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative gain (loss) 0 5,069 0 10,014
Forward contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative gain (loss) $ 332 $ (31) $ 57 $ 17