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Debt - Insurance Notes Payable (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Short-term Debt [Line Items]    
Total outstanding $ 0 $ 5,627
Insurance Notes Payable | Insurance Notes Payable Due October 2019    
Short-term Debt [Line Items]    
Debt instrument, face amount   $ 6,800
Debt instrument, interest rate   3.90%
Total outstanding   $ 5,600