2018 Credit Facility - Our primary financing arrangement is the $400 million unsecured credit facility (the “2018 credit facility” or the “credit facility”), which provides us with the capital necessary to meet our working capital needs as well as the flexibility to continue with our strategic initiatives, including business acquisitions and share repurchases. The 2018 credit facility matures in 2023. The balance outstanding under the 2018 credit facility was $383.0 million and $105.5 million at March 31, 2020 and December 31, 2019, respectively. Effective interest rates, including the impact of interest rate swaps associated with the 2018 credit facility, were as follows:

We had approximately $10.0 million of available funds under the credit facility at March 31, 2020, net of outstanding letters of credit of $1.3 million. As of March 31, 2020, we were in compliance with our debt covenants.

Other Line of Credit - We have an unsecured $20.0 million line of credit by and among CBIZ Benefits and Insurance, Inc. and the Huntington National Bank. We utilize this line to support our short-term funding requirements of payroll client fund obligations due to the investment of client funds, rather than liquidating client funds that have already been invested in available-for-sale securities. The line of credit, which terminates August 6, 2020, did not have a balance outstanding at March 31, 2020. Refer to our Annual Report on Form 10-K for the year ended December 31, 2019 for additional details of our debt and financing arrangements.

Interest Expense - Interest expense, including amortization of deferred financing costs, commitment fees, line of credit fees, and other applicable bank charges, was as follows (in thousands):

	Three Months Ended
	March 31,
	2020		2019
2018 credit facility	$	1,101	$	1,382
Other line of credit		1		—
Other		17		19
	$	1,119	$	1,401

Three Months Ended

Weighted average rates

Range of effective rates

1.61% - 4.75%

2.12% - 5.50%