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Long-Term Debt (Details) - 2012 Note - 8¼% Limited Convertible Senior Subordinated Notes Due 2012 [Member] - USD ($)
12 Months Ended
Feb. 15, 2019
Dec. 31, 2019
Dec. 31, 2018
Long-Term Debt (Details) - 2012 Note [Line Items]      
Long-term Debt   $ 352,000 $ 387,000
Debt Instrument, Maturity Date   Mar. 01, 2012  
Interest Payable, Current   $ 300,000 $ 298,000
Debt Instrument, Face Amount $ 35,000    
Debt Exchange Each Principal Amount Of Original Debt Exchanged 1,000    
Repayment Of Convertible Debt Principal 200    
Debt Exchanged Aggregate Payment $ 7,000    
Gain (Loss) on Extinguishment of Debt   $ 52,000