maturity requirements on long-term debt as of december 31 , 2018 by year are as follows ( in thousands ) : years ending december 31 .
what portion of the total outstanding long-term debt is included in the current liabilities section as of december 31 , 2018?
credit facility we are party to a credit facility agreement with bank of america , n.a. , as administrative agent , and a syndicate of financial institutions as lenders and other agents ( as amended from time to time , the 201ccredit facility 201d ) . as of december 31 , 2018 , the credit facility provided for secured financing comprised of ( i ) a $ 1.5 billion revolving credit facility ( the 201crevolving credit facility 201d ) ; ( ii ) a $ 1.5 billion term loan ( the 201cterm a loan 201d ) , ( iii ) a $ 1.37 billion term loan ( the 201cterm a-2 loan 201d ) , ( iv ) a $ 1.14 billion term loan facility ( the 201cterm b-2 loan 201d ) and ( v ) a $ 500 million term loan ( the 201cterm b-4 loan 201d ) . substantially all of the assets of our domestic subsidiaries are pledged as collateral under the credit facility . the borrowings outstanding under our credit facility as of december 31 , 2018 reflect amounts borrowed for acquisitions and other activities we completed in 2018 , including a reduction to the interest rate margins applicable to our term a loan , term a-2 loan , term b-2 loan and the revolving credit facility , an extension of the maturity dates of the term a loan , term a-2 loan and the revolving credit facility , and an increase in the total financing capacity under the credit facility to approximately $ 5.5 billion in june 2018 . in october 2018 , we entered into an additional term loan under the credit facility in the amount of $ 500 million ( the 201cterm b-4 loan 201d ) . we used the proceeds from the term b-4 loan to pay down a portion of the balance outstanding under our revolving credit facility . the credit facility provides for an interest rate , at our election , of either libor or a base rate , in each case plus a margin . as of december 31 , 2018 , the interest rates on the term a loan , the term a-2 loan , the term b-2 loan and the term b-4 loan were 4.02% ( 4.02 % ) , 4.01% ( 4.01 % ) , 4.27% ( 4.27 % ) and 4.27% ( 4.27 % ) , respectively , and the interest rate on the revolving credit facility was 3.92% ( 3.92 % ) . in addition , we are required to pay a quarterly commitment fee with respect to the unused portion of the revolving credit facility at an applicable rate per annum ranging from 0.20% ( 0.20 % ) to 0.30% ( 0.30 % ) depending on our leverage ratio . the term a loan and the term a-2 loan mature , and the revolving credit facility expires , on january 20 , 2023 . the term b-2 loan matures on april 22 , 2023 . the term b-4 loan matures on october 18 , 2025 . the term a loan and term a-2 loan principal amounts must each be repaid in quarterly installments in the amount of 0.625% ( 0.625 % ) of principal through june 2019 , increasing to 1.25% ( 1.25 % ) of principal through june 2021 , increasing to 1.875% ( 1.875 % ) of principal through june 2022 and increasing to 2.50% ( 2.50 % ) of principal through december 2022 , with the remaining principal balance due upon maturity in january 2023 . the term b-2 loan principal must be repaid in quarterly installments in the amount of 0.25% ( 0.25 % ) of principal through march 2023 , with the remaining principal balance due upon maturity in april 2023 . the term b-4 loan principal must be repaid in quarterly installments in the amount of 0.25% ( 0.25 % ) of principal through september 2025 , with the remaining principal balance due upon maturity in october 2025 . we may issue standby letters of credit of up to $ 100 million in the aggregate under the revolving credit facility . outstanding letters of credit under the revolving credit facility reduce the amount of borrowings available to us . borrowings available to us under the revolving credit facility are further limited by the covenants described below under 201ccompliance with covenants . 201d the total available commitments under the revolving credit facility at december 31 , 2018 were $ 783.6 million . global payments inc . | 2018 form 10-k annual report 2013 85 .