(9) Debt

Debt at December 31, 2017 and June 30, 2017 consisted of the following (in thousands):


	December 31, 2017		June 30, 2017
Short-term debt	$	1,020,000	$	-
Deferred borrowing costs		(868)		-
Short-term debt, net		1,019,132		-
		-
Long-term debt	$	-	$	1,080,000
Deferred borrowing costs		-		(1,389)
Long-term debt, net	$	-	$	1,078,611
Total debt	$	1,019,132	$	1,078,611

Credit Facility

On October 31, 2013, we entered into a revolving credit agreement, as borrower, with lenders, including Union Bank, N.A., as administrative agent, joint lead arranger, swing line lender and letters of credit issuer, and HSBC Bank USA, National Association, as syndication agent and joint lead arranger, providing for a revolving credit facility of $700.0 million, with an uncommitted option to increase the revolving credit facility by an additional $300.0 million. On April 4, 2016, in connection with our acquisition of Brightree LLC (“Brightree”), we entered into a first amendment to the revolving credit agreement to increase the size of the revolving credit facility from $700.0 million to $1.0 billion, with an uncommitted option to increase the revolving credit facility by an additional $300.0 million, and to make other modifications to provide for the acquisition of Brightree. On January 9, 2017, we entered into a second amendment to our agreement with our existing lenders, including MUFG Union Bank, N.A. as successor in interest to Union Bank, N.A., as Administrative Agent, Joint Lead Arranger, Swing Line Lender and L/C Issuer; and HSBC Bank USA, National Association, as Syndication Agent and Joint Lead Arranger. The second amendment, among other things, increased the size of our senior unsecured revolving credit facility from $1.0 billion to $1.3 billion, with an uncommitted option to increase the revolving credit facility by an additional $300.0 million. The credit facility terminates on October 31, 2018, when all unpaid principal and interest under the loans must be repaid. The outstanding principal amount due under the credit facility bears interest at a rate equal to LIBOR plus 1.0% to 2.0% (depending on the then-applicable leverage ratio). At December 31, 2017, the interest rate that was being charged on the outstanding principal amount was 2.8%. A commitment fee of 0.15% to 0.25% (depending on the then-applicable leverage ratio) applies on the unused portion of the credit facility. The credit facility also includes a $25.0 million sublimit for letters of credit.

Our obligations under the revolving credit agreement are unsecured but are guaranteed by certain of our direct and indirect U. S. subsidiaries, including ResMed Corp., ResMed Motor Technologies Inc., Birdie Inc., Inova Labs, Inc., Brightree, Brightree Services LLC, Brightree Home Health & Hospice LLC and Strategic AR LLC, under an unconditional guaranty. The credit agreement contains customary covenants, including certain financial covenants and an obligation that we maintain certain financial ratios, including a maximum leverage ratio of funded debt to EBITDA (as defined in the credit agreement) and an interest coverage ratio.

At December 31, 2017, there was $1,020.0 million outstanding under the revolving credit facility.