DEBT

6 Months Ended

Sep. 30, 2018

Credit Agreement

In December 2017, we entered into a Seventh Amendment to our Second Amended and Restated Credit Agreement (as amended, the "Credit Agreement"). The Credit Agreement provides for borrowings of up to $100,000 which may be increased by up to $100,000 pursuant to the terms of the Credit Agreement and which is secured by substantially all of our assets and the equity of our subsidiaries. The Credit Agreement expires on August 18, 2019. Revolving loans under the Credit Agreement bear interest at our election of (a) 0.25% to 0.75% above a certain base rate (5.25% at September 30, 2018) or (b) 1.25% to 1.75% above the LIBOR Rate (approximately 2.24% at September 30, 2018), with the margin rate subject to the achievement of certain average liquidity levels. We are also required to pay a monthly fee on the unused available balance, ranging from 0.25% to 0.375% based on availability. We had no outstanding borrowings at September 30, 2018 and March 31, 2018.

Availability under the Credit Agreement is unrestricted when liquidity, as defined in the Credit Agreement, is at least $300,000. When liquidity is below $300,000 availability under the Credit Agreement is restricted by our United States and United Kingdom based accounts receivable and inventory balances. The Credit Agreement also allows for the issuance of letters of credit in an aggregate amount of up to $5,000.

Information related to availability on our Credit Agreement was as follows:



	September 30, 2018		March 31, 2018
Available borrowings	$	98,335	$	98,335
Outstanding letters of credit	1,664		1,664

We recorded interest expense and fees related to the Credit Agreement of $111 and $111, respectively for the three months ended September 30, 2018 and 2017 and $221 and $221 for the six months ended September 30, 2018 and 2017, respectively. The Credit Agreement contains covenants that substantially limit our, and our subsidiaries', ability to create, incur, assume or be liable for indebtedness; dispose of assets outside the ordinary course of business; acquire, merge or consolidate with or into another person or entity; create, incur or allow any lien on any of their respective properties; make investments; or pay dividends or make distributions (each subject to certain limitations); or optionally prepay any indebtedness (subject to certain exceptions, including an exception permitting the redemption of our unsecured convertible senior notes upon the meeting of certain minimum liquidity requirements). In addition, the Credit Agreement provides for certain events of default such as nonpayment of principal and interest, breaches of representations and warranties, noncompliance with covenants, acts of insolvency, default on indebtedness held by third parties and default on certain material contracts (subject to certain limitations and cure periods). The Credit Agreement also contains a requirement that we maintain an interest coverage ratio of more than one to one for the trailing twelve-month period, if certain average liquidity levels fall below $30,000.

1.00% Convertible Notes Due 2018

On June 18, 2013, we issued $250,000 aggregate principal amount of 1.00% Convertible Notes due 2018 (the "1.00% Convertible Notes"). The 1.00% Convertible Notes were issued at 98.5% of par value for proceeds of $246,250. Interest on the 1.00% Convertible Notes was payable semi-annually in arrears on July 1st and January 1st of each year, commencing on January 1, 2014. The 1.00% Convertible Notes matured on July 1, 2018, unless earlier repurchased by the Company or converted. We also granted the underwriters a 30-day option to purchase up to an additional $37,500 principal amount of 1.00% Convertible Notes to cover overallotments, if any. On July 17, 2013, we closed our public offering of $37,500 principal amount of our 1.00% Convertible Notes as a result of the underwriters exercising their overallotment option in full on July 12, 2013, bringing the total proceeds to $283,188.

The 1.00% Convertible Notes were convertible at an initial conversion rate of 46.4727 shares of our common stock per $1 principal amount of 1.00% Convertible Notes (representing an initial conversion price of approximately $21.52 per share of common stock for a total of approximately 13,361 underlying conversion shares) subject to adjustment in certain circumstances.

During the three months ended September 30, 2018, 1.00% Convertible Notes with an aggregate principal amount of $5,183 were settled.

The following table provides the components of interest expense related to our 1.00% Convertible Notes:



	Three Months Ended September 30,				Six Months Ended September 30,
	2018		2017		2018		2017
Cash interest expense (coupon interest expense)	$	—	$	130	$	1	$	579
Non-cash amortization of discount on 1.00% Convertible Notes	—		8,678		91		13,915
Amortization of debt issuance costs	—		263		3		423
Total interest expense related to 1.00% Convertible Notes	$	—	$	9,071	$	95	$	14,917