Annual report pursuant to Section 13 and 15(d)

Income Taxes (Narrative) (Details)

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Income Taxes (Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Income Taxes    
Income tax expense $ 521,000 $ 449,000
Effective income tax rate (0.30%) (0.20%)
Operating Loss Carryforwards $ 366,400,000  
Minimum ownership interest in subsidiaries for consolidated income tax return 80.00%  
Increase (decrease) in valuation allowance $ 48,400,000  
Income tax credits expiration date Dec. 31, 2028  
Unrecognized tax benefits   $ 3,200,000
Accrued interest related to uncertain tax positions $ 100,000 32,000
Unrecognized tax benefits impact effective tax rate 800,000 $ 700,000
Federal    
Income Taxes    
Net operating losses (NOLs) $ 714,400,000  
Net operating losses (NOLs), expiration Dec. 31, 2032  
Income tax credits $ 33,800,000  
Operating loss carryforwards without expiration 518,900,000  
State and Local Jurisdiction    
Income Taxes    
Net operating losses (NOLs) $ 970,000,000.0  
Net operating losses (NOLs), expiration Dec. 31, 2026  
Income tax credits $ 5,200,000  
Operating loss carryforwards without expiration $ 16,200,000