Long Term Debt

Long-term debt consists of the following at December 31:



	2018		2017
Revolving line of credit	$	312,000	$	327,000
Term loan, net of deferred debt issuance costs of $311 and $467 in 2018 and 2017, respectively	144,064		157,033
Mortgage notes	836		2,410
Total debt	456,900		486,443
Less: Current portion	18,336		14,699
Total long-term debt	$	438,564	$	471,744

On January 4, 2016, we entered into a fifth amended and restated senior credit agreement consisting of: (a) a $175.0 million term loan facility and (b) a $525.0 million revolving credit facility both expiring on January 4, 2021. The term loan is payable in quarterly installments increasing over the term of the facility. Proceeds from the term loan facility and borrowings under the revolving credit facility were used to repay the then existing senior credit agreement and to finance the acquisition of SurgiQuest. Interest rates are at LIBOR plus an interest rate margin (the total of which is equal to 4.405% at December 31, 2018). For those borrowings where we elect to use the alternate base rate, the base rate is the greatest of (i) the Prime Rate, (ii) the Federal Funds Rate plus 0.50% or (iii) the one-month Eurocurrency Rate plus 1.00%, plus, in each case, an interest rate margin.

In conjunction with this agreement, we incurred charges included in other expense in the 2016 statement of comprehensive income related to commitment fees paid to certain of our lenders, which provided a financing commitment for the SurgiQuest acquisition totaling $2.7 million and recorded a loss on the early extinguishment of debt of $0.3 million.

There were $144.4 million in borrowings outstanding on the term loan as of December 31, 2018. There were $312.0 million in borrowings outstanding under the revolving credit facility as of December 31, 2018. Our available borrowings on the revolving credit facility at December 31, 2018 were $210.0 million with approximately $3.0 million of the facility set aside for outstanding letters of credit.

The fifth amended and restated senior credit agreement is collateralized by substantially all of our personal property and assets. The fifth amended and restated senior credit agreement contains covenants and restrictions which, among other things, require the maintenance of certain financial ratios and restrict dividend payments and the incurrence of certain indebtedness and other activities, including acquisitions and dispositions. We were in full compliance with these covenants and restrictions as of December 31, 2018. We are also required, under certain circumstances, to make mandatory prepayments from net cash proceeds from any issuance of equity and asset sales.

As described in Note 17, on February 7, 2019 we entered into a sixth amended and restated senior credit agreement consisting of: (a) a $265.0 million term loan facility and (b) a $585.0 million revolving credit facility. The revolving credit facility will terminate and the loans outstanding under the term loan facility will expire on the earlier of (i) February 7, 2024 or (ii) 91 days prior to the earliest scheduled maturity date of the $345.0 million in 2.625% convertible notes due in 2024 described below, (if, as of such date, more than $150.0 million in aggregate principal amount of such convertible notes (or any refinancing thereof) remains outstanding). The term loan is payable in quarterly installments increasing over the term of the facility and borrowing.

As further described in Note 17, on January 29, 2019, we issued $345.0 million in 2.625% convertible notes due in 2024.

We have a mortgage note outstanding in connection with the Largo, Florida property and facilities bearing interest at 8.25% per annum with semiannual payments of principal and interest through June 2019. The principal balance outstanding on the mortgage note aggregated $0.8 million at December 31, 2018. The mortgage note is collateralized by the Largo, Florida property and facilities.

The scheduled maturities of long-term debt outstanding at December 31, 2018 are as follows:



2019	$	18,336
2020	17,500
2021	421,375
2022	—
2023	—
Thereafter	—