The following table summarizes the major components of debt at each balance sheet date and provides maturities and interest rate ranges for each major category as of June 30, 2019 and December 31, 2018:



	June 30, 2019			December 31, 2018
Various equipment notes entered into in November 2017, payable in monthly installments ranging from $5 to $24, including interest at 5.2%, maturing in December 2022 through December 2023. The notes are secured by equipment with a net book value of $3,931 as of June 30, 2019.	$	4,450		$	4,949
Various equipment notes entered into in 2018, payable in monthly installments ranging from $1 to $39, including interest ranging from 5.61% to 6.80%, maturing in March 2023 through May 2025. The notes are secured by equipment with a net book value of $10,779 as of June 30, 2019.	11,375			12,293
Various equipment notes entered into in 2019, payable in monthly installments of $3, including interest of 4.7%, maturing in May 2021 through March 2024. The notes are secured by equipment with a net book value of $249 as of June 30, 2019.	252			—
In June 2018, the Company entered into a $12,000 convertible, non-revolving credit note with a bank. The credit note converted to a term loan on April 10, 2019, with a maturity date of April 10, 2024. Interest on borrowings subsequent to the conversion date is calculated at a fixed rate per annum equal to 4.44%. The note is secured by equipment with a net book value of $10,642 as of June 30, 2019.	11,400			8,299
In April 2019, the Company entered into a $4,000 convertible, non-revolving credit note with a bank. The credit note will convert to a term loan on August 25, 2019, with a maturity date of July 24, 2024. Interest on borrowings is calculated at a fixed rate per annum equal to 4.64%. The note is secured by equipment with a net book value of $999 as of June 30, 2019.	1,029			—
A $10,000 equipment line with a bank, entered into in December 2017, secured by all equipment purchased with the proceeds of the loan. Interest is calculated on any outstanding amounts using a fixed rate of 4.5%. The equipment line converted to a term loan in September 2018, with a maturity date of June 22, 2023. The note is secured by equipment with a net book value of $7,566 as of June 30, 2019.	8,650			9,563
The Closing Date Term Loan and Delayed Draw Term Loan entered into in September 2018 as part of the Credit Facility (see Note 6). The interest rate applicable to the Closing Date Term Loan and Delayed Draw Term Loan is based on a fluctuating rate of interest measured by reference to, at the Company’s election, either (i) the Eurodollar rate, currently LIBOR, or (ii) an alternative base rate. Principal payments required are $52,563 in September 2019, $2,563 in December 2019, $42,625 in March 2020, $2,625 quarterly through September 2020, $3,938 quarterly through September 2022 and $5,250 quarterly through September 2023. The remaining outstanding amounts will be due in September 2023. The loan is secured by substantially all of the assets of the Company, and is subject to certain financial covenants.	202,313			202,438
Total	239,469			237,542
Less debt issuance costs	(2,910		)	(3,252		)
	236,559			234,290
Less current maturities	(108,722		)	(23,268		)
Notes payable due after one year	$	127,837		$	211,022