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Income Taxes - Narrative (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Taxes        
Effect of Tax Act $ 5,600,000 $ 0 $ (1,441,000) $ 5,633,000
Valuation allowance   $ 0 0  
Minimum cumulative change in ownership that could result in a Section 382 ownership change (as a percent)   50.00%    
Amount of unrecognized tax benefits $ 2,906,000 $ 2,906,000 2,906,000 $ 2,906,000
Tax benefits that would impact the effective tax rate   0    
Interest and penalties accrued related to unrecognized tax benefits   424,000,000 $ 246,000,000  
Federal income tax purpose        
Income Taxes        
Net operating loss carryforward   20,200,000    
California franchise tax purpose        
Income Taxes        
Net operating loss carryforward   $ 6,900,000