DEBT | 9. DEBT Credit Agreement In April 2016, we entered into a Sixth 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 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 (3.75% at June 30, 2016), or (b) 1.25% to 1.75% above the LIBOR Rate (approximately 1.71% at June 30, 2016), 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 June 30, 2016 and March 31, 2016. 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 is as follows: June 30, 2016 March 31, 2016 Available borrowings $ $ Outstanding letters of credit We recorded interest expense and fees related to the Credit Agreement of $110 for each of the three months ended June 30, 2016 and 2015. The Credit Agreement contains covenants that substantially limit us 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. 1.75% Convertible Notes Due 2016 On November 16, 2011, we issued $250,000 aggregate principal amount of 1.75% Convertible Notes due 2016. The issuance of the 1.75% Convertible Notes included $30,000 related to the exercise of an over-allotment option by the underwriters. Interest on the 1.75% Convertible Notes is payable semi-annually in arrears on June 1st and December 1st of each year, commencing on June 1, 2012. The 1.75% Convertible Notes mature on December 1, 2016, unless earlier repurchased by the Company or converted. We do not have the right to redeem the 1.75% Convertible Notes prior to maturity. The 1.75% Convertible Notes are convertible at an initial conversion rate of 52.3745 shares of our common stock per $1 principal amount of 1.75% Convertible Notes (representing an initial conversion price of approximately $19.093 per share of common stock for a total of approximately 13,094,000 underlying conversion shares) subject to adjustment in certain circumstances. As of June 1, 2016 until the close of business on the business day immediately preceding the maturity date, holders may convert their 1.75% Convertible Notes at any time. Upon conversion, the 1.75% Convertible Notes may be settled, at our election, in cash, shares of our common stock, or a combination of cash and shares of our common stock. Our current intent and ability, given our option, would be to settle the 1.75% Convertible Notes conversion in shares of our common stock. As such, we have continued to classify these 1.75% Convertible Notes as long-term debt. Upon the occurrence of certain fundamental changes involving the Company, holders of the 1.75% Convertible Notes may require us to purchase all or a portion of their 1.75% Convertible Notes for cash at a price equal to 100% of the principal amount of the notes to be purchased, plus accrued and unpaid interest (including additional interest, if any) to, but excluding, the fundamental change purchase date. The indenture governing the 1.75% Convertible Notes contains customary terms and covenants and events of default. If an event of default (as defined therein) occurs and is continuing, the Trustee by notice to the Company, or the holders of at least 25% in aggregate principal amount of the 1.75% Convertible Notes then outstanding by notice to the Company and the Trustee, may, and the Trustee at the request of such holders shall, declare 100% of the principal of and accrued and unpaid interest (including additional interest, if any) on all the 1.75% Convertible Notes to be due and payable. In the case of an event of default arising out of certain bankruptcy events, 100% of the principal of and accrued and unpaid interest (including additional interest, if any), on the 1.75% Convertible Notes will automatically become due and payable immediately. The 1.75% Convertible Notes are senior unsecured obligations and rank senior in right of payment to our existing and future indebtedness that is expressly subordinated in right of payment to the 1.75% Convertible Notes; equal in right of payment to our existing and future indebtedness that is not so subordinated; effectively junior in right of payment to any of our secured indebtedness to the extent of the value of the assets securing such indebtedness; and structurally junior to all existing and future indebtedness incurred by our subsidiaries. We separately account for the liability and equity components of the 1.75% Convertible Notes in a manner that reflects our nonconvertible debt borrowing rate when interest expense is recognized in subsequent periods. We estimated the fair value of the 1.75% Convertible Notes to be $197,373, as of the date of issuance of our 1.75% Convertible Notes, assuming a 6.9% non-convertible borrowing rate. The carrying amount of the equity component was determined to be $52,627 by deducting the fair value of the liability component from the par value of the 1.75% Convertible Notes. The excess of the principal amount of the liability component over its carrying amount is amortized to interest and other, net over the term of the 1.75% Convertible Notes using the effective interest method. The equity component is not remeasured as long as it continues to meet the conditions for equity classification. In accounting for the $6,875 of banking, legal and accounting fees related to the issuance of the 1.75% Convertible Notes, we allocated $5,428 to the liability component and $1,447 to the equity component. Debt issuance costs attributable to the liability component are being amortized to interest and other, net over the term of the 1.75% Convertible Notes, and issuance costs attributable to the equity component were netted with the equity component in additional paid-in capital. As of June 30, 2016 and March 31, 2016, the if-converted value of our 1.75% Convertible Notes exceeded the principal amount of $250,000 by $246,524 and $243,251, respectively. The following table provides additional information related to our 1.75% Convertible Notes: June 30, 2016 March 31, 2016 Additional paid-in capital $ $ ​ ​ ​ ​ ​ ​ ​ ​ Principal amount of 1.75% Convertible Notes $ $ Unamortized discount of the liability component Carrying amount of debt issuance costs ​ ​ ​ ​ ​ ​ ​ ​ Net carrying amount of 1.75% Convertible Notes $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The following table provides the components of interest expense related to our 1.75% Convertible Notes: Three Months Ended June 30, 2016 2015 Cash interest expense (coupon interest expense) $ $ Non-cash amortization of discount on 1.75% Convertible Notes Amortization of debt issuance costs ​ ​ ​ ​ ​ ​ ​ ​ Total interest expense related to 1.75% Convertible Notes $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 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 were issued at 98.5% of par value for proceeds of $246,250. Interest on the 1.00% Convertible Notes is payable semi-annually in arrears on July 1st and January 1st of each year, commencing on January 1, 2014. The 1.00% Convertible Notes mature on July 1, 2018, unless earlier repurchased by the Company or converted. We do not have the right to redeem the 1.00% Convertible Notes prior to maturity. 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 are 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 13,361,000 underlying conversion shares) subject to adjustment in certain circumstances. Holders may convert the 1.00% Convertible Notes at their option prior to the close of business on the business day immediately preceding January 1, 2018 only under the following circumstances: (1) during any fiscal quarter commencing after September 30, 2013, if the last reported sale price of the common stock for at least 20 trading days (whether or not consecutive) during a period of 30 consecutive trading days ending on the last trading day of the preceding fiscal quarter is greater than or equal to 130% of the applicable conversion price on each applicable trading day; (2) during the five business day period after any 10 consecutive trading day period (the "measurement period") in which the trading price per $1 principal amount of 1.00% Convertible Notes for each day of that measurement period was less than 98% of the product of the last reported sale price of our common stock and the applicable conversion rate on each such day; or (3) upon the occurrence of specified corporate events. On and after January 1, 2018 until the close of business on the business day immediately preceding the maturity date, holders may convert their 1.00% Convertible Notes at any time, regardless of the foregoing circumstances. Upon conversion, the 1.00% Convertible Notes may be settled, at our election, in cash, shares of our common stock, or a combination of cash and shares of our common stock. Our common stock price exceeded 130% of the applicable conversion price per share for at least 20 trading days during the 30 consecutive trading days ended June 30, 2016. Accordingly, as of July 1, 2016, the 1.00% Convertible Notes may be converted at the holder's option through September 30, 2016. Our current intent and ability, given our option, would be to settle the 1.00% Convertible Notes conversion in shares of our common stock. As such, we have continued to classify these 1.00% Convertible Notes as long-term debt. Upon the occurrence of certain fundamental changes involving the Company, holders of the 1.00% Convertible Notes may require us to purchase all or a portion of their 1.00% Convertible Notes for cash at a price equal to 100% of the principal amount of the notes to be purchased, plus accrued and unpaid interest (including additional interest, if any) to, but excluding, the fundamental change purchase date. The indenture governing the 1.00% Convertible Notes contains customary terms and covenants and events of default. If an event of default (as defined therein) occurs and is continuing, the Trustee by notice to the Company, or the holders of at least 25% in aggregate principal amount of the 1.00% Convertible Notes then outstanding by notice to the Company and the Trustee, may, and the Trustee at the request of such holders shall, declare 100% of the principal of and accrued and unpaid interest (including additional interest, if any) on all the 1.00% Convertible Notes to be due and payable. In the case of an event of default arising out of certain bankruptcy events, 100% of the principal of and accrued and unpaid interest (including additional interest, if any), on the 1.00% Convertible Notes will automatically become due and payable immediately. The 1.00% Convertible Notes are senior unsecured obligations and rank senior in right of payment to our existing and future indebtedness that is expressly subordinated in right of payment to the 1.00% Convertible Notes; equal in right of payment to our existing and future indebtedness that is not so subordinated; effectively junior in right of payment to any of our secured indebtedness to the extent of the value of the assets securing such indebtedness; and structurally junior to all existing and future indebtedness incurred by our subsidiaries. We separately account for the liability and equity components of the 1.00% Convertible Notes in a manner that reflects our nonconvertible debt borrowing rate. We estimated the fair value of the 1.00% Convertible Notes to be $225,567 upon issuance of our 1.00% Convertible Notes, assuming a 6.15% non-convertible borrowing rate. The carrying amount of the equity component was determined to be approximately $57,621 by deducting the fair value of the liability component from the net proceeds of the 1.00% Convertible Notes. The excess of the principal amount of the liability component over its carrying amount is amortized to interest and other, net over the term of the 1.00% Convertible Notes using the effective interest method. The equity component is not remeasured as long as it continues to meet the conditions for equity classification. In accounting for the $2,815 of banking, legal and accounting fees related to the issuance of the 1.00% Convertible Notes, we allocated $2,209 to the liability component and $606 to the equity component. Debt issuance costs attributable to the liability component are being amortized to interest and other, net over the term of the 1.00% Convertible Notes, and issuance costs attributable to the equity component were netted with the equity component in additional paid-in capital. As of June 30, 2016 and March 31, 2016, the if-converted value of our 1.00% Convertible Notes exceeded the principal amount of $287,500 by $219,149 and $215,809, respectively. The following table provides additional information related to our 1.00% Convertible Notes: June 30, 2016 March 31, 2016 Additional paid-in capital $ $ ​ ​ ​ ​ ​ ​ ​ ​ Principal amount of 1.00% Convertible Notes $ $ Unamortized discount of the liability component Carrying amount of debt issuance costs ​ ​ ​ ​ ​ ​ ​ ​ Net carrying amount of 1.00% Convertible Notes $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The following table provides the components of interest expense related to our 1.00% Convertible Notes: Three Months Ended June 30, 2016 2015 Cash interest expense (coupon interest expense) $ $ Non-cash amortization of discount on 1.00% Convertible Notes Amortization of debt issuance costs ​ ​ ​ ​ ​ ​ ​ ​ Total interest expense related to 1.00% Convertible Notes $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ |