Long-Term Debt

At December 31, 2018 and 2017, long-term debt consisted of the following (in thousands):



	2018			2017
$200 million revolving credit facility, due March 31, 2023	$	—		$	—
Term B loan facility, due June 5, 2022	337,000			588,000
Term B loan facility, due April 2, 2025	787,000			—
	1,124,000			588,000
Unamortized deferred loan costs	(23,576		)	(12,787		)
	$	1,100,424		$	575,213

On April 2, 2018, in connection with the acquisition of ECS, the Company amended its credit facility mainly to add an $822.0 million tranche to the term B loan facility that matures on April 2, 2025. The amendment also provided for the ability to increase the loan facilities by an amount not to exceed the sum of (i) $300.0 million, (ii) the aggregate principal of voluntary prepayments of the term B loans and permanent reductions of the revolving commitments, and (iii) additional amounts so long as the pro forma consolidated secured leverage ratio is no greater than 3.25 to 1.00. The revolving credit facility was also amended to extend the maturity date to March 31, 2023. The Company incurred $22.5 million of debt issuance and amendment costs, of which $15.3 million are presented in the consolidated balance sheet as a reduction of outstanding debt and are being amortized over the term of the credit facility, $6.2 million were expensed as incurred and presented in interest expense, and the remaining fees were presented in other current assets and other non-current assets and are being amortized over the term of the credit facility.

Borrowings under the term B loans bear interest at LIBOR, plus 2.00 percent. Borrowings under the revolving credit facility bear interest at LIBOR plus 1.25 to 2.25 percent, or the bank’s base rate plus 0.25 to 1.25 percent, depending on leverage levels. A commitment fee of 0.20 to 0.35 percent is payable on the undrawn portion of the revolving credit facility. At December 31, 2018, the interest on the term B loans was 4.52 percent and there were no borrowings under the revolving credit facility.

For the term B loan that matures on June 5, 2022, there are no required minimum payments until its maturity date. For the term B loan that matures on April 2, 2025, the Company is required to make minimum quarterly payments of $2.1 million; however, as a result of principal payments made through December 31, 2018, the first required minimum quarterly payment of $2.1 million is not due until September 30, 2022. The Company is also required to make mandatory prepayments on its term loans from excess cash flow and with the proceeds of asset sales, debt issuances and specified other events, subject to certain exceptions. The credit facility is secured by substantially all of our assets and includes various restrictive covenants including the maximum ratio of consolidated secured debt to consolidated earnings before interest, taxes, depreciation and amortization ("EBITDA"), which steps down at regular intervals from 4.75 to 1.00 as of December 31, 2018, to 3.75 to 1.00 as of September 30, 2021 and thereafter. The credit facility also contains certain customary limitations including, among other terms and conditions, the Company's ability to incur additional indebtedness, engage in mergers and acquisitions, and declare dividends.

At December 31, 2018, the Company was in compliance with its debt covenants, its ratio of consolidated secured debt to consolidated EBITDA was 2.69 to 1.00, and it had $195.6 million available borrowing capacity under its revolving credit facility.