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Series B Debentures, Net of Current Maturities (Tables)
6 Months Ended
Jun. 30, 2020
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments
   December 31,
2019
   June 30,
2020
 
       Unaudited 
         
Series B Debentures  $69,287   $118,778 
Less: Current maturities   (9,898)   (19,796)
Less: Unamortized debt premium, discount and issuance costs   (539)   (548)
           
   $58,850   $98,434