Annual report pursuant to Section 13 and 15(d)

FAIR VALUE OF FINANCIAL INSTRUMENTS - Gains (Losses) Recorded (Details)

v3.6.0.2
FAIR VALUE OF FINANCIAL INSTRUMENTS - Gains (Losses) Recorded (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Investment [Line Items]      
Realized/unrealized gain on investments $ (685) $ 22,264 $ 69,593
Measured on a Recurring Basis | Level 3      
Investment [Line Items]      
Realized/unrealized gain on investments 11,237 28,854  
Impairment (reversal) (110) (2,357)  
Total 11,127 26,497  
Realized/unrealized gain on investments, net, from investments transferred into Level 3 during the period $ 0 $ 0