Debt

Long-term debt in the Consolidated Balance Sheets is summarized as follows:



	December 31,
(Thousands)	2018			2017
Fixed rate industrial development revenue bonds payable in annual installments through 2021	$	3,041		$	3,818
Total debt outstanding	3,041			3,818
Current portion of long-term debt	(823		)	(777		)
Gross long-term debt	2,218			3,041
Unamortized deferred financing fees	(152		)	(214		)
Long-term debt	$	2,066		$	2,827

Maturities on long-term debt instruments as of December 31, 2018 are as follows:



(Thousands)
2019	$	823
2020	868
2021	1,350
2022	—
2023	—
Thereafter	—
Total	$	3,041

In 2015, the Company entered into an Amended and Restated Credit Agreement (Credit Agreement) that matures in 2020 and provides for a $375.0 million revolving credit facility comprised of sub-facilities for revolving loans, swing-line loans, letters of credit, and foreign borrowings. The Credit Agreement provides the Company and its subsidiaries with additional capacity to enter into facilities for the consignment, borrowing, or leasing of precious metals and copper, and provides enhanced flexibility to finance acquisitions and other strategic initiatives. The Credit Agreement also provides for an uncommitted incremental facility whereby, under certain conditions, the Company may be able to borrow additional term loans in an aggregate amount not to exceed $300.0 million. The Credit Agreement is secured by substantially all of the assets of the Company and its direct subsidiaries, with the exception of non-mining real property and certain other assets. The Credit Agreement allows the Company to borrow money at a premium over LIBOR or prime rate and at varying maturities. The premium resets quarterly according to the terms and conditions available under the Credit Agreement.

The Credit Agreement includes restrictive covenants relating to restrictions on additional indebtedness, acquisitions, dividends, and stock repurchases. In addition, the Credit Agreement includes covenants subject to a maximum leverage ratio and a minimum fixed charge coverage ratio. The Company was in compliance with all of its debt covenants as of December 31, 2018 and December 31, 2017.

At December 31, 2018 and 2017, respectively, there was $27.2 million and $27.3 million outstanding against the letters of credit sub-facility. The Company pays a variable commitment fee that may reset quarterly (0.2% as of December 31, 2018) of the available and unborrowed amounts under the revolving credit line.

While the available borrowings under the individual existing credit lines total $355.4 million, the covenants in the Credit Agreement restrict the aggregate borrowings to $275.5 million as of December 31, 2018.

In April 2011, the Company entered into an agreement with the Toledo-Lucas County Port Authority and the Dayton–Montgomery County Port Authority in Ohio to co-issue $8.0 million in taxable development revenue bonds, with a fixed amortization term that will mature in 2021. The interest rate on these bonds was fixed at 4.90%, and the unamortized balance of the bonds was $3.0 million at December 31, 2018.