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Income Taxes - Tax credit carryforward (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Tax credit carryforward      
Income tax receivable $ 2,843 $ 3,914  
Decrease in alternative minimum tax credit credit carryforward 1,100    
Alternative minimum tax credit carryforward $ 2,800    
Federal      
Tax credit carryforward      
Decrease in alternative minimum tax credit credit carryforward   4,500  
Alternative minimum tax credit carryforward   $ 3,900  
ATM credit carryforward | Federal      
Tax credit carryforward      
Income tax receivable     $ 8,400