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Investments (Tables)
 6 Months Ended
Jun. 30, 2020
Investments, All Other Investments [Abstract]  
Investments
The following table presents the carrying value of our investments (in thousands) as of:
June 30, 2020December 31, 2019
Investment in privately held oil and gas company$1,500  $8,359  
Cash surrender value of life insurance contracts13,423  13,056  
Other investments515  514  
Total investments$15,438  $21,929