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FINANCIAL INSTRUMENTS Schedule of Fair Values of Financial Contracts Outstanding (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Derivative [Line Items]    
Schedule of Derivative Instruments
At December 31, 2017, the fair values of financial contracts outstanding were as follows: 
Financial Contracts
 
Listing
currency
 (1)
 
Notional amount of
underlying instruments
 
Fair value of net assets
(obligations)
on financial
contracts
 
 
 
 
($ in thousands)
Financial contracts receivable
 
 
 
 
 
 
Call options
 
USD
 
2,656

 
$
91

Commodity Swaps
 
USD
 
17,833

 
2,142

Forwards
 
KRW
 
41,379

 
801

Futures
 
USD
 
5,874

 
12

Interest rate swaps
 
JPY
 
21,269

 
479

Put options (2)
 
USD
 
155

 
1

Total return swaps – equities
 
EUR/GBP/USD
 
34,965

 
9,357

Warrants and rights on listed equities
 
EUR/USD
 
29

 
10

Total financial contracts receivable, at fair value
 
 
 
 
 
$
12,893

Financial contracts payable
 
 
 
 
 
 
Commodity Swaps
 
USD
 
26,795

 
$
(353
)
Put options
 
USD
 
130

 
(14
)
Total return swaps – equities
 
EUR/GBP/KRW/RON/USD
 
60,663

 
(21,855
)
Total financial contracts payable, at fair value
 
 
 
 
 
$
(22,222
)

(1) USD = US Dollar; EUR = Euro; GBP = British Pound; JPY = Japanese Yen; KRW = Korean Won; RON = Romanian New Leu.
(2) Includes options on the Chinese Yuan, denominated in U.S. dollars.
At December 31, 2016, the fair values of financial contracts outstanding were as follows: 
Financial Contracts
 
Listing currency (1)
 
Notional amount of
underlying instruments
 
Fair value of net assets
(obligations)
on financial
contracts
 
 
 
 
($ in thousands)
Financial contracts receivable
 
 
 
 
 
 
Call options
 
USD
 
134,495

 
$
26,508

Commodity Swaps
 
USD
 
82,009

 
13,506

Interest rate swaps
 
JPY
 
20,490

 
218

Put options (2)
 
USD
 
115,481

 
6,703

Total return swaps – equities
 
EUR/GBP/USD
 
100,199

 
29,413

Warrants and rights on listed equities
 
EUR/USD
 
67

 
33

Total financial contracts receivable, at fair value
 
 
 
 
 
$
76,381

Financial contracts payable
 
 
 
 
 
 
Forwards
 
KRW
 
6,880

 
(118
)
Put options
 
USD
 
815

 
(172
)
Total return swaps – equities
 
EUR/GBP/KRW/RON/USD
 
31,257

 
(1,947
)
Total financial contracts payable, at fair value
 
 
 
 
 
$
(2,237
)

(1) USD = US Dollar; EUR = Euro; GBP = British Pound; JPY = Japanese Yen; KRW = Korean Won; RON = Romanian New Leu.
(2) Includes options on the Japanese Yen and the Chinese Yuan, denominated in U.S. dollars.
Financial contracts receivable, Fair value of net assets (obligations) on financial contracts $ 12,893 $ 76,381
Financial contracts payable, Fair value of net assets (obligations) on financial contracts (22,222) (2,237)
Financial contracts receivable    
Derivative [Line Items]    
Financial contracts receivable, Fair value of net assets (obligations) on financial contracts 12,893 76,381
Financial contracts receivable | Call options    
Derivative [Line Items]    
Financial contracts receivable, Notional amount of underlying instruments 2,656 134,495
Financial contracts receivable, Fair value of net assets (obligations) on financial contracts 91 26,508
Financial contracts receivable | Commodity Contract [Member]    
Derivative [Line Items]    
Financial contracts receivable, Notional amount of underlying instruments 17,833 82,009
Financial contracts receivable, Fair value of net assets (obligations) on financial contracts 2,142 13,506
Financial contracts receivable | Forwards    
Derivative [Line Items]    
Financial contracts receivable, Notional amount of underlying instruments 41,379  
Financial contracts receivable, Fair value of net assets (obligations) on financial contracts 801  
Financial contracts receivable | Futures    
Derivative [Line Items]    
Financial contracts receivable, Notional amount of underlying instruments 5,874  
Financial contracts receivable, Fair value of net assets (obligations) on financial contracts 12  
Financial contracts receivable | Interest rate options    
Derivative [Line Items]    
Financial contracts receivable, Notional amount of underlying instruments 21,269 20,490
Financial contracts receivable, Fair value of net assets (obligations) on financial contracts 479 218
Financial contracts receivable | Put options (2)    
Derivative [Line Items]    
Financial contracts receivable, Notional amount of underlying instruments 155 115,481
Financial contracts receivable, Fair value of net assets (obligations) on financial contracts 1 [1] 6,703 [2]
Financial contracts receivable | Total return swaps – equities    
Derivative [Line Items]    
Financial contracts receivable, Notional amount of underlying instruments 34,965 100,199
Financial contracts receivable, Fair value of net assets (obligations) on financial contracts 9,357 29,413
Financial contracts receivable | Total return swaps – equities    
Derivative [Line Items]    
Financial contracts receivable, Notional amount of underlying instruments 29 67
Financial contracts receivable, Fair value of net assets (obligations) on financial contracts 10 33
Weather derivative swap    
Derivative [Line Items]    
Financial contracts payable, Fair value of net assets (obligations) on financial contracts (22,222) (2,237)
Weather derivative swap | Commodity Contract [Member]    
Derivative [Line Items]    
Financial contracts payable, Notional amount of underlying instruments 26,795  
Financial contracts payable, Fair value of net assets (obligations) on financial contracts (353)  
Weather derivative swap | Forwards    
Derivative [Line Items]    
Financial contracts payable, Notional amount of underlying instruments   6,880
Financial contracts payable, Fair value of net assets (obligations) on financial contracts   (118)
Weather derivative swap | Put options (2)    
Derivative [Line Items]    
Financial contracts payable, Notional amount of underlying instruments 130 815
Financial contracts payable, Fair value of net assets (obligations) on financial contracts (14) (172)
Weather derivative swap | Total return swaps – equities    
Derivative [Line Items]    
Financial contracts payable, Notional amount of underlying instruments 60,663 31,257
Financial contracts payable, Fair value of net assets (obligations) on financial contracts $ (21,855) $ (1,947)
[1] Includes options on the Chinese Yuan, denominated in U.S. dollars.
[2] Includes options on the Japanese Yen and the Chinese Yuan, denominated in U.S. dollars.