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Debt - Summary of total debt (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Total future principal payments	$ 106,479	$ 89,792
Less: Current portion of long-term debt	(6,856)	(3,681)
Long-term debt	99,623	86,111
Notes Payable to Banks [Member]
Total future principal payments	$ 54,069	31,486
Revolving Credit Facility [Member]
Term (years)	5 years
Total future principal payments	$ 52,410	58,306
Equipment Note One [Member] | Notes Payable to Banks [Member]
Stated Interest Rate (per annum)	4.16%
Term (years)	5 years
Total future principal payments	$ 11,734	12,655
Equipment Note Two [Member] | Notes Payable to Banks [Member]
Stated Interest Rate (per annum)	4.23%
Term (years)	7 years
Total future principal payments	$ 11,745	12,279
Equipment Note Three [Member] | Notes Payable to Banks [Member]
Stated Interest Rate (per annum)	3.97%
Term (years)	5 years
Total future principal payments	$ 2,291	2,291
Equipment Note Four [Member] | Notes Payable to Banks [Member]
Stated Interest Rate (per annum)	4.02%
Term (years)	7 years
Total future principal payments	$ 2,313	2,313
Equipment Note Five [Member] | Notes Payable to Banks [Member]
Stated Interest Rate (per annum)	4.01%
Term (years)	7 years
Total future principal payments	$ 1,948	1,948
Equipment Note Six [Member] | Notes Payable to Banks [Member]
Stated Interest Rate (per annum)	2.89%
Term (years)	7 years
Total future principal payments	$ 15,005	0
Equipment Note Seven [Member] | Notes Payable to Banks [Member]
Stated Interest Rate (per annum)	3.09%
Term (years)	5 years
Total future principal payments	$ 9,033	$ 0

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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No definition available.

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