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Investments (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Feb. 28, 2018
Assets used to Acquire Other Investments             $ 28,000
Impairment of investment $ 0 $ 6,900 $ 19,741 $ 6,859 $ 19,741    
Investments 15,659     15,659   $ 21,929  
Investment in privately held oil and gas company              
Investments 1,500     1,500   8,359  
Cash surrender value of life insurance contracts              
Investments 13,467     13,467   13,056  
Other investments              
Investments $ 692     $ 692   $ 514  
Valuation, Income Approach              
Discount Rate Used in Valuation of Fair Value of Oil and Gas Reserve Quantities     10.00%   10.00%