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Debt - Summary of total debt (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
Debt Instrument [Line Items] |  |
Total debt | $ 178,190 | $ 89,792
Less: Current portion of long-term debt | (6,552) | (3,681)
Long-term debt | 171,638 | 86,111
Notes Payable to Banks [Member] |  |
Debt Instrument [Line Items] |  |
Total debt | $ 52,217 | 31,486
Revolving Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Term (years) | 5 years |
Total debt | $ 125,973 | 58,306
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 | $ 10,793 | 12,655
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 | $ 11,200 | 12,279
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 | $ 2,124 | 2,291
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 | $ 2,211 | 2,313
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 | $ 1,851 | 1,948
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 | $ 15,005 | 0
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 | $ 9,033 | $ 0

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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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