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Investments (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Sep. 30, 2019
Mar. 31, 2019
Dec. 31, 2019
Feb. 28, 2019
Assets used to Acquire Other Investments         $ 28,000
Impairment of investment $ 6,859 $ 20,000 $ 0    
Investments 15,250     $ 21,929  
Equity Securities          
Investments 1,500     8,359  
Cash surrender value of life insurance contracts          
Investments 13,235     13,056  
Total investments          
Investments $ 515     $ 514  
Valuation, Income Approach          
Discount Rate Used in Valuation of Fair Value of Oil and Gas Reserve Quantities   10.00%