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Debt (Tables)
3 Months Ended
Mar. 31, 2021
Debt Disclosure [Abstract]  
Credit facility
Daily average amounts outstanding under our credit facility were as follows:
(in thousands)Quarter Ended March 31, 2021Year Ended
December 31, 2020
Daily average amount outstanding$840,165 $1,016,896 
Weighted-average interest rate
2.00 %2.12 %

As of March 31, 2021, amounts were available for borrowing under our revolving credit facility as follows:
(in thousands)Total
available
Revolving credit facility commitment$1,150,000 
Amount drawn on revolving credit facility(840,000)
Outstanding letters of credit(1)
(7,658)
Net available for borrowing as of March 31, 2021
$302,342 

(1) We use standby letters of credit to collateralize certain obligations related primarily to our self-insured workers’ compensation claims, as well as claims for environmental matters, as required by certain states. These letters of credit reduce the amount available for borrowing under our revolving credit facility.