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ACCOUNTING POLICIES (Details 3)
3 Months Ended
Mar. 31, 2020
USD ($)
subsidiary
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
subsidiary
Fixed assets      
Asset Impairment Charges $ 0 $ 0  
Equity Securities, FV-NI, Gain (Loss) (1,619,000) (618,000)  
Impairment of long-lived assets 0 0  
Depreciation      
Depreciation of property and equipment 6,646,000 6,575,000  
Accumulated depreciation of fixed assets 226,400,000   $ 221,800,000
Equity investments under ASC 321      
Carrying amount of equity investments under ASC 321 3,900,000   3,900,000
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    
Marketable Securities and Equity Securities, FV-NI 4,300,000   11,100,000
Equity method investments      
Revenue from Contract with Customer, Excluding Assessed Tax 351,573,000 367,729,000  
Equity Investments 49,500,000   $ 37,300,000
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability $ 5,000,000    
Noncontrolling Interest      
Number Of Broker-Dealer Subsidiary | subsidiary 2   2
Off-balance Sheet Obligation Threshold $ 2,000,000    
Cost of goods sold — retail      
Depreciation      
Depreciation of property and equipment 190,000 175,000  
Technology      
Depreciation      
Depreciation of property and equipment 4,771,000 5,175,000  
General and administrative      
Depreciation      
Depreciation of property and equipment $ 1,685,000 1,225,000  
Building      
Fixed assets      
Life 40 years    
Land improvements      
Fixed assets      
Life 20 years    
Internal-use software and website development      
Additional Disclosure      
Capitalized costs $ 2,900,000 3,500,000  
Amortization of capitalized costs $ 3,400,000 3,200,000  
PeerNova, Inc. [Member]      
Equity method investments      
Equity Method Investment, Ownership Percentage 11.00%    
MVI [Member]      
Equity method investments      
Revenue from Contract with Customer, Excluding Assessed Tax $ 1,574,000 $ 608,000  
Minimum | Building machinery and equipment      
Fixed assets      
Life 15 years    
Minimum | Furniture and equipment      
Fixed assets      
Life 5 years    
Minimum | Computer hardware      
Fixed assets      
Life 3 years    
Minimum | Computer software      
Fixed assets      
Life 2 years    
Maximum | Building machinery and equipment      
Fixed assets      
Life 20 years    
Maximum | Furniture and equipment      
Fixed assets      
Life 7 years    
Maximum | Computer hardware      
Fixed assets      
Life 4 years    
Maximum | Computer software      
Fixed assets      
Life 4 years