FINANCIAL INSTRUMENTS Schedule of Volume of Derivative Activities (Details) - Derivatives not designated as hedging instruments (notional amounts) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Entered	$ 1,284,569	$ 2,684,389
Exited	564,959	2,518,050
Forwards
Derivative [Line Items]
Entered	34,652	6,880
Exited	1,739	3,128
Futures
Derivative [Line Items]
Entered	38,207	1,966,368
Exited	32,537	1,988,782
Interest rate swaps
Derivative [Line Items]
Entered		20,490
Exited		0
Options, warrants, and rights
Derivative [Line Items]
Entered	950,811	462,429	[1]
Exited	133,407	366,285	[1]
Commodity Contract [Member]
Derivative [Line Items]
Entered	2,025	141,534
Exited	41,830	100,045
Total return swaps
Derivative [Line Items]
Entered	258,874	86,688
Exited	$ 355,446	$ 59,810

[1] Exited amount excludes derivatives which expired or were exercised during the period.