Annual report pursuant to Section 13 and 15(d)

Income Taxes (Narrative) (Details)

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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Income Tax Disclosure [Line Items]    
Effective income tax rate 0.00% 0.00%
Operating Loss Carryforwards, Valuation Allowance $ 251,100  
Minimum ownership interest in subsidiaries for consolidated income tax return 80.00%  
Unrecognized tax benefits $ 0  
Income tax expense (benefit) 473 $ 136
Unrecognized tax benefits, interest and penalties 0  
Increase (decrease) in valuation allowance $ 47,000  
Income tax credits expiration date Dec. 31, 2028  
Federal [Member]    
Income Tax Disclosure [Line Items]    
Operating loss carryforwards without expiration $ 409,700  
Net operating losses (NOLs) 615,000  
Income tax credits $ 21,900  
Net operating losses (NOLs), expiration Dec. 31, 2032  
State and Local Jurisdiction [Member]    
Income Tax Disclosure [Line Items]    
Operating loss carryforwards without expiration $ 3,100  
Net operating losses (NOLs) 797,300  
Income tax credits $ 1,800  
Net operating losses (NOLs), expiration Dec. 31, 2022