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Other Current Assets and Other Assets - Other Current Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Other Current Assets and Other Assets    
Non-trade receivables $ 6,063 $ 6,711
Prepaid maintenance 2,942 2,767
Prepaid insurance 266 264
Other prepaid assets 3,086 3,931
Total other current assets $ 12,357 $ 13,673