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Other Current Assets and Other Assets - Other Current Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Other Current Assets and Other Assets    
Non-trade receivables $ 7,540 $ 6,711
Prepaid maintenance 3,277 2,767
Prepaid insurance 909 264
Other prepaid assets 2,763 3,931
Total other current assets $ 14,489 $ 13,673