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The Company maintains self-insurance programs for that portion of its health care and workers compensation costs not covered by insurance. The Company also provides certain health care and life insurance benefits to certain eligible retirees through postretirement benefit programs. The Company's share of the cost of such plans for most participants is fixed, and any increase in the cost of such plans will be the responsibility of the retirees. The Company funds the benefit costs for such plans on a pay-as-you- go basis. Since the Company's obligation for postretirement medical plans is fixed and since the accumulated postretirement benefit obligation ("APBO") and the net postretirement benefit expense are not material in relation to the Company's financial condition or results of operations, we believe any change in medical costs from that estimated will not have a significant impact on the Company. The discount rate used in determining the APBO at December 31, 2004 and 2003 was 5.75% and 6.15%, respectively. Summary information on the Company's postretirement medical plans is as follows: 

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## Note 6—Leases 

At December 31, 2004, the Company was committed under operating leases which expire at various dates through 2010. Total rent expense under operating leases for the years 2004, 2003, and 2002 were $17,664, $18,650 and $16,007, respectively. 

Minimum lease payments under non-cancelable operating leases are as follows: 

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