	April 3,			December 31,
	2020			2019
Senior Credit Facilities – term loan	$	4,910		$	5,073
Less: unamortized debt issuance costs		(39	)		(42	)
Total current portion of long-term debt	$	4,871		$	5,031

Senior Credit Facilities – term loan	$	91,810		$	96,095
Senior Credit Facilities – revolving credit facility		120,112			123,384
Less: unamortized debt issuance costs		(5,170	)		(4,145	)
Total long-term debt	$	206,752		$	215,334

Total Senior Credit Facilities	$	211,623		$	220,365

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 and included an uncommitted “accordion” feature pursuant to which the commitments under the revolving credit facility may be increased by an additional $200.0 million in aggregate, subject to certain customary conditions.

On March 27, 2020, the Company entered into an amendment (the “First Amendment”) to the Third Amended and Restated Credit Agreement and exercised a portion of the uncommitted accordion feature. The First Amendment increased the revolving credit facility commitment under the Third Amended and Restated Credit Agreement by $145.0 million, from $350.0 million to $495.0 million and reset the uncommitted accordion feature to $200.0 million for potential future expansion.

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 balance 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 any time through December 2024. The Company repaid €1.1 million ($1.2 million) of its term loan during the three months ended April 3, 2020.

The Company is required to satisfy certain financial and non-financial covenants under the Third Amended and Restated Credit Agreement. The Third Amended and Restated Credit Agreement also contains customary events of default. The Company was in compliance with these covenants as of April 3, 2020.

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.

As of April 3, 2020 and December 31, 2019, the outstanding balance of the Company’s debt approximated its fair value based on current rates available to the Company for debt of similar maturities. The fair value of the Company’s debt is classified as Level 2 under the fair value hierarchy.