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Debt - Schedule of remaining principal payments for long term obligations (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Total future principal payments $ 165,824 $ 89,792
Less: current portion of equipment notes (8,737) (3,681)
Long-term principal obligations 157,087 86,111
Notes Payable to Banks [Member]    
Debt Instrument [Line Items]    
Total future principal payments 62,004 $ 31,486
Master Loan Agreement [Member] | Notes Payable to Banks [Member]    
Debt Instrument [Line Items]    
2020 8,737  
2021 8,349  
2022 8,645  
2023 11,906  
2024 8,923  
Thereafter 15,444  
Total future principal payments 62,004  
Less: current portion of equipment notes (8,737)  
Long-term principal obligations $ 53,267