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Income Taxes - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Income Taxes        
Income tax expense (Benefit) $ (541) $ 33 $ (680) $ 35
U.S. statutory rate 21.00%   21.00%  
Estimated aggregate alternative minimum tax refund receivable $ 1,200   $ 1,200  
Alternative minimum tax refund receivable recorded $ 691   $ 691