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ACCOUNTING POLICIES Impairment for Equity Securities without Readily Determinable Fair Value (Details) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]      
Equity Securities without Readily Determinable Fair Value, Impairment Loss And Downward Adjustments $ (5,708,000) $ (536,000) $ (5,487,000)
Equity Securities without Readily Determinable Fair Value [Table Text Block]
The impairments and downward adjustments for the period related to equity securities without readily determinable fair values at December 31, 2019, 2018 and 2017 is as follows (in thousands):
 
Year ended December 31,
 
2019
 
2018
 
2017
Impairments and downward adjustments of equity securities without readily determinable fair values
$
(5,708
)
 
$
(536
)
 
$
(5,487
)
Upward adjustments of equity securities without readily determinable fair values
$
—

 
$
958

 
$
—

    
Equity Securities without readily determinable fair value upward adjustments $ 0 958,000 $ 0
Other Long-term Investments 3,900,000 $ 17,700,000  
Equity Securities without Readily Determinable Fair Value, Downward Price Adjustment, Cumulative Amount 6,200,000    
Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Cumulative Amount $ 958,000