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Investments (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Feb. 28, 2018
Assets used to Acquire Other Investments               $ 28,000
Impairment of investment $ 0 $ 6,900 $ 20,000 $ 0 $ 6,859 $ 0    
Investments 15,438       15,438   $ 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 13,423       13,423   13,056  
Other investments                
Investments $ 515       $ 515   $ 514  
Valuation, Income Approach                
Discount Rate Used in Valuation of Fair Value of Oil and Gas Reserve Quantities     10.00%