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Debt - Summary of total debt (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Total debt	$ 109,946	$ 89,792
Less: Current portion of long-term debt	(3,742)	(3,681)
Long-term debt	106,204	86,111
Notes Payable to Banks [Member]
Total debt	$ 30,031	31,486
Revolving Credit Facility [Member]
Term (years)	5 years
Total debt	$ 79,915	58,306
Equipment Note One [Member] | Notes Payable to Banks [Member]
Stated Interest Rate (per annum)	4.16%
Term (years)	5 years
Total debt	$ 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 debt	$ 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 debt	$ 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 debt	$ 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 debt	$ 1,948	$ 1,948

X

- Definition

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

+ References

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-Publisher FASB
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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.

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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Topic 470
-SubTopic 20
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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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