pre_text: Results of Operations: Years Ended December 31, 2018, versus Year Ended December 31, 2017 (Amounts in thousands, except percentages and per share amounts): Capital Resources Long-term debt was comprised of the following: On February 12, 2019, we entered into an amended and restated five-year Credit Agreement with a group of banks (the "Credit Agreement") to extend the term of the facility. The Credit Agreement provides for a revolving credit facility of $300,000, which may be increased by $150,000 at the request of the Company, subject to the administrative agent's approval. This new unsecured credit facility replaces the prior $300,000 unsecured credit facility, which would have expired August 10, 2020. Borrowings of $50,000 under the prior credit agreement were refinanced into the Credit Agreement. The prior agreement was terminated as of February 12, 2019. The Revolving Credit Facility includes a swing line sublimit of $15,000 and a letter of credit sublimit of $10,000. Borrowings under the Revolving Credit Facility bear interest at the base rate defined in the Credit Agreement. We also pay a quarterly commitment fee on the unused portion of the Revolving Credit Facility. The commitment fee ranges from 0.20% to 0.30% based on the our total leverage ratio. We have entered into interest rate swap agreements to fix interest rates on $50,000 of long-term debt through February 2024. The difference to be paid or received under the terms of the swap agreements is recognized as an adjustment to interest expense when settled. We have historically funded our capital and operating needs primarily through cash flows from operating activities, supported by available credit under our Revolving Credit Facility. We believe that cash flows from operating activities and available borrowings under our Revolving Credit Facility will be adequate to fund our working capital needs, capital expenditures, and debt service requirements for at least the next twelve months. However, we may choose to pursue additional equity and debt financing to provide additional liquidity or to fund acquisitions.
table: As of December 31,
table: 2019 2018
table: Total credit facility $300,000 $300,000
table: Balance Outstanding $99,700 $50,000
table: Standby letters of credit $1,800 $1,940
table: Amount available $198,500 $248,060
table: Weighted-average interest rate 3.25% 3.10%
table: Commitment fee percentage per annum 0.23% 0.20%
question: Analyse this data from a financial earnings document. What was the change in balance outstanding between 2018 and 2019?