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INCOME AND FRANCHISE TAXES (Tax Credit Carryforwards) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Operating loss carryforwards    
Net deferred tax assets $ 58,926,000 $ 81,979,000
Expiration period of tax credit carryforwards 20 years  
Unrecognized tax benefits that, if recognized would favorably affect the effective income tax rate $ 0  
Federal    
Operating loss carryforwards    
Tax credit carryforwards that do not expire 7,600,000  
Tax credit carryforwards 19,800,000  
Tax credit carryforwards that expire 12,200,000  
State    
Operating loss carryforwards    
Tax credit carryforwards that do not expire 12,300,000  
State | CALIFORNIA    
Operating loss carryforwards    
Net operating loss carryforwards $ 38,800,000