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Debt - Summary of total debt (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2020 | Dec. 31, 2019
Debt Instrument [Line Items] |  |
Total debt | $ 81,968 | $ 165,824
Less: current portion of long-term debt | (7,186) | (8,737)
Long-term debt | 74,782 | 157,087
Notes Payable to Banks [Member] |  |
Debt Instrument [Line Items] |  |
Total debt | $ 48,571 | 62,004
Revolving Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Term (years) | 5 years |
Total debt | $ 33,397 | 103,820
Equipment Note One [Member] | Notes Payable to Banks [Member] |  |
Debt Instrument [Line Items] |  |
Stated Interest Rate (per annum) | 4.16% |
Term (years) | 5 years |
Total debt | $ 0 | 10,643
Equipment Note Two [Member] | Notes Payable to Banks [Member] |  |
Debt Instrument [Line Items] |  |
Stated Interest Rate (per annum) | 4.23% |
Term (years) | 7 years |
Total debt | $ 10,643 | 11,200
Equipment Note Three [Member] | Notes Payable to Banks [Member] |  |
Debt Instrument [Line Items] |  |
Stated Interest Rate (per annum) | 3.97% |
Term (years) | 5 years |
Total debt | $ 1,779 | 1,953
Equipment Note Four [Member] | Notes Payable to Banks [Member] |  |
Debt Instrument [Line Items] |  |
Stated Interest Rate (per annum) | 4.02% |
Term (years) | 7 years |
Total debt | $ 2,003 | 2,108
Equipment Note Five [Member] | Notes Payable to Banks [Member] |  |
Debt Instrument [Line Items] |  |
Stated Interest Rate (per annum) | 4.01% |
Term (years) | 7 years |
Total debt | $ 1,649 | 1,751
Equipment Note Six [Member] | Notes Payable to Banks [Member] |  |
Debt Instrument [Line Items] |  |
Stated Interest Rate (per annum) | 2.89% |
Term (years) | 7 years |
Total debt | $ 13,596 | 14,286
Equipment Note Seven [Member] | Notes Payable to Banks [Member] |  |
Debt Instrument [Line Items] |  |
Stated Interest Rate (per annum) | 3.09% |
Term (years) | 5 years |
Total debt | $ 8,359 | 9,033
Equipment Note Eight [Member] | Notes Payable to Banks [Member] |  |
Debt Instrument [Line Items] |  |
Stated Interest Rate (per annum) | 2.75% |
Term (years) | 5 years |
Total debt | $ 6,008 | 6,496
Equipment Note Nine [Member] | Notes Payable to Banks [Member] |  |
Debt Instrument [Line Items] |  |
Stated Interest Rate (per annum) | 3.01% |
Term (years) | 7 years |
Total debt | $ 4,534 | $ 4,534

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