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Debt - Summary of Total Debt (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Total debt	$ 29,420	$ 165,824
Less: current portion of long-term debt	(4,381)	(8,737)
Long-term debt	25,039	157,087
Notes Payable to Banks
Debt Instrument [Line Items]
Total debt	$ 29,420	62,004
Equipment Note 1 | Notes Payable to Banks
Debt Instrument [Line Items]
Stated Interest Rate (per annum)	4.16%
Term (years)	5 years
Total debt	$ 0	10,643
Equipment Note 2 | Notes Payable to Banks
Debt Instrument [Line Items]
Stated Interest Rate (per annum)	4.23%
Term (years)	7 years
Total debt	$ 0	11,200
Equipment Note 3 | Notes Payable to Banks
Debt Instrument [Line Items]
Stated Interest Rate (per annum)	3.97%
Term (years)	5 years
Total debt	$ 0	1,953
Equipment Note 4 | Notes Payable to Banks
Debt Instrument [Line Items]
Stated Interest Rate (per annum)	4.02%
Term (years)	7 years
Total debt	$ 0	2,108
Equipment Note 5 | Notes Payable to Banks
Debt Instrument [Line Items]
Stated Interest Rate (per annum)	4.01%
Term (years)	7 years
Total debt	$ 0	1,751
Equipment Note 6 | Notes Payable to Banks
Debt Instrument [Line Items]
Stated Interest Rate (per annum)	2.89%
Term (years)	7 years
Total debt	$ 12,896	14,286
Equipment Note 7 | Notes Payable to Banks
Debt Instrument [Line Items]
Stated Interest Rate (per annum)	3.09%
Term (years)	5 years
Total debt	$ 6,980	9,033
Equipment Note 8 | Notes Payable to Banks
Debt Instrument [Line Items]
Stated Interest Rate (per annum)	2.75%
Term (years)	5 years
Total debt	$ 5,513	6,496
Equipment Note 9 | Notes Payable to Banks
Debt Instrument [Line Items]
Stated Interest Rate (per annum)	3.01%
Term (years)	7 years
Total debt	$ 4,031	4,534
Revolving Credit Facility
Debt Instrument [Line Items]
Term (years)	5 years
Total debt	$ 0	$ 103,820

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- Definition

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

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-Publisher FASB
-Name Accounting Standards Codification
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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.

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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

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