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Supplemental Cash Flow Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Supplemental Disclosure of Cash Flow Information    
Cash paid for interest, net of amounts capitalized $ (1,260) $ (2,157)
Cash received for income taxes 616 0
Supplemental Disclosure of Noncash Investing and Financing Activities    
Purchase of PP&E in accounts payable 396 4,592
Right-of-use assets obtained in exchange for financing lease obligations 67 3,347
Carrying value of properties exchanged $ 3,890 $ 5,384