(6)	LONG-TERM DEBT

On June 26, 2017, the Company entered into an amendment of its existing unsecured revolving credit facility (“Revolving Credit Facility”) with a group of commercial banks that increases the borrowing limit from $550,000,000 to $850,000,000 and extends the maturity date to June 26, 2022. The Revolving Credit Facility provides for a variable interest rate based on the London Interbank Offered Rate (“LIBOR”) or an alternate base rate calculated with reference to the agent bank’s prime rate, among other factors (“Alternate Base Rate”). The interest rate spread varies with the Company’s senior debt rating and is currently 1.00% over LIBOR or equal to the Alternate Base Rate. In addition, the Revolving Credit Facility allows for a $300,000,000 increase in the aggregate commitments of the banks in the form of revolving credit loans or term loans, subject to the consent of each bank that elects to participate in the increased commitment. Borrowings under the Revolving Credit Facility may be used for general corporate purposes, the purchase of existing or new equipment, the purchase of the Company’s common stock, or for business acquisitions. The Company recognized additional interest expense of $187,000 in the 2017 second quarter due to the write-off of certain deferred issue costs in connection with the amendment of the Revolving Credit Facility.