	December 31,
	2019			2018
Senior Credit Facilities – term loan	$	5,073		$	4,600
Less: unamortized debt issuance costs		(42	)		(65	)
Total current portion of long-term debt		5,031			4,535

Senior Credit Facilities – term loan		96,095			69,925
Senior Credit Facilities – revolving credit facility		123,384			135,058
Less: unamortized debt issuance costs		(4,145	)		(2,140	)
Total long-term debt		215,334			202,843

Total Senior Credit Facilities	$	220,365		$	207,378

On December 31, 2019, the Company entered into an amended and restated credit agreement (the “Third Amended and Restated Credit Agreement”) with existing lenders for an aggregate credit facility of $450.0 million, consisting of a $100.0 million U.S. dollar equivalent euro-denominated (approximately €90.2 million) 5-year term loan facility and a $350.0 million 5-year revolving credit facility (collectively, the “Senior Credit Facilities”). The Senior Credit Facilities mature in December 2024. The Third Amended and Restated Credit Agreement amended and restated the Second Amended and Restated Credit Agreement dated as of May 19, 2016.

The borrowings outstanding under the Senior Credit Facilities bear interest at rates based on (a) the Base Rate, as defined in the Third Amended and Restated Credit Agreement, plus a margin ranging between 0.25% to 1.25% per annum, determined by reference to the Company’s consolidated leverage ratio, or (b) the Eurocurrency Rate, as defined in the Third Amended and Restated Credit Agreement, plus a margin ranging between 1.25% and 2.25% per annum, determined by reference to the

Company’s consolidated leverage ratio. In addition, the Company is obligated to pay a commitment fee on the unused portion of the revolving credit facility, ranging between 0.20% and 0.40% per annum, determined by reference to the Company’s consolidated leverage ratio.

The Third Amended and Restated Credit Agreement contains various customary representations, warranties and covenants applicable to the Company and its subsidiaries, including, among others: (i) limitations on restricted payments, including dividend payments and stock repurchases, provided that the Company and its subsidiaries may repurchase their equity interests so long as, immediately after giving effect to the repurchase, the Company’s consolidated leverage ratio is no more than 3.25:1.00, with a step up to 3.75:1.00 for four consecutive quarters following an acquisition with an aggregate consideration greater than or equal to $50.0 million, and the satisfaction of other customary conditions; (ii) limitations on fundamental changes involving the Company and its subsidiaries; (iii) limitations on the disposition of assets; and (iv) limitations on indebtedness, investments, and liens. The Third Amended and Restated Credit Agreement also requires the Company to satisfy certain financial covenants, such as maintaining a minimum consolidated fixed charge coverage ratio of 1.50:1.00 and a maximum consolidated leverage ratio of 3.50:1.00. The maximum consolidated leverage ratio will increase to 4.00:1.00 for four consecutive quarters following an acquisition with an aggregate consideration greater than or equal to $50.0 million.

As of December 31, 2019, the outstanding principal under the Company’s term loan facility is scheduled to be repaid as follows (in thousands):

	Principal Amount
2020	$	5,073
2021		5,071
2022		5,071
2023		5,071
2024		80,882
Total debt repayments	$	101,168

The outstanding principal balance under the term loan facility is payable in quarterly installments of €1.1 million beginning in March 2020, with the remaining due upon maturity. The Company may make additional principal payments at any time, which will reduce the next quarterly installment payment due. Borrowings under the revolving credit facility may be repaid at anytime through December 2024. The Company may be required to prepay outstanding loans under the Third Amended and Restated Credit Agreement with the net proceeds of certain asset dispositions and incurrences of certain debt. At the election of the Company, and so long as no default shall have occurred, the Company may reinvest all, or any portion of, the net proceeds from such asset dispositions or incurrences of debt within a year.

As of December 31, 2019, the Company had $226.6 million available to be drawn under the revolving credit facility. Excluding commitment fees, the weighted average interest rate for the Senior Credit Facilities was approximately 2.34% as of December 31, 2019. The commitment fee rate for the unused commitments under the revolving credit facility was approximately 0.30% as of December 31, 2019.

The Senior Credit Facilities is guaranteed by Novanta Inc., Novanta Corporation, NDS Surgical Imaging LLC, Med X Change, Inc., Novanta Medical Technologies Corp., Novanta Europe GmbH, Novanta UK Investments Holding Limited and Novanta Technologies UK Limited (collectively, “Guarantors”). Each Guarantor, jointly and severally, unconditionally guarantees the due and punctual payment of the principal, interest and fees under the Senior Credit Facilities, when due and payable, whether at maturity, by required prepayment, by acceleration or otherwise. In addition, Guarantors guarantee the due and punctual payment, fees and interest on the overdue principal of the Senior Credit Facilities and the due and punctual performance of all obligations of the Company in accordance with the terms of the Third Amended and Restated Credit Agreement. Furthermore, each Guarantor, jointly and severally, unconditionally guarantees that in the event of any extension, renewal, amendment, refinancing or modification of any of the Senior Credit Facilities, amounts due will be promptly paid in full when due in accordance with the terms of the extension or renewal, at stated maturity, by acceleration or otherwise.

The obligations of each Guarantor are limited to the maximum amount, after giving effect to all other contingent and fixed liabilities or any collections from, or payments made by or on behalf of, any other Guarantor. Each Guarantor that makes a payment

or distribution under a Guarantee is entitled to a contribution from each other Guarantor of its pro rata share based on the adjusted net assets of each Guarantor. If at any time any payment of any of the obligations of the Guarantors is rescinded or must otherwise be returned upon the insolvency, bankruptcy or reorganization of the Company, a Guarantor or otherwise, the Guarantees will continue to be effective or be reinstated, as the case may be, as though such payment had not been made.

Each Guarantor may be released from its obligations under its respective Guarantee and its obligations under the Third Amended and Restated Credit Agreement upon the occurrence of certain events, including, but not limited to: (i) the Guarantor ceasing to be a subsidiary; or (ii) payment in full of the principal and accrued and unpaid interest on the Senior Credit Facilities and all other obligations.

The maximum potential amount of future payments the Guarantors could be required to make under the Guarantee is the principal amount of the Senior Credit Facilities plus all accrued and unpaid interest thereon. However, as of December 31, 2019, the Guarantors were not expected to be required to perform under the Guarantee.

The Company’s obligations under the Senior Credit Facilities are secured, on a senior basis, by a lien on substantially all of the assets of Novanta Inc. The Third Amended and Restated Credit Agreement also contains customary events of default.

In connection with the execution of the Third Amended and Restated Credit Agreement, the Company capitalized an additional $3.0 million of deferred financing costs. The Company allocated these costs between the term loan and the revolving credit facility based on the maximum borrowing capacity and amortizes the costs on a straight-line basis over the term of the Senior Credit Facilities. Previously unamortized deferred financing costs will continue to be amortized. Non-cash interest expense related to the amortization of the deferred financing costs was $1.1 million, $1.0 million and $0.8 million in 2019, 2018 and 2017, respectively. Unamortized deferred financing costs are presented as a reduction to the debt balances on the consolidated balance sheets.

As of December 31, 2019 and 2018, the outstanding balance of the Company’s debt approximated its fair value based on current rates available to the Company for debt of the same maturities. The fair value of the Company’s debt is classified as Level 2 under the fair value hierarchy.