DEBT

2% Convertible Senior Notes due June 2022

On June 30, 2015, the Company issued an aggregate principal amount of $600.0 million of 2.00% Convertible Senior Notes due June 2022 (the “Notes”) in a private placement offering, which are the Company’s senior unsecured obligations. The Notes were issued pursuant to an Indenture dated June 30, 2015 (the “Indenture”) between the Company and Wilmington Trust, N.A. as trustee. The Indenture includes customary covenants and sets forth certain events of default after which the Notes may be due and payable immediately. The Notes will mature on June 15, 2022, unless earlier redeemed, repurchased or converted. The Notes bear interest at a rate of 2.00% per year, and interest is payable semiannually in arrears on June 15 and December 15 of each year, beginning from December 15, 2015.

The conversion rate for the Notes is initially set at 15.7858 shares per $1,000 of principal amount, which is equivalent to an initial conversion price of $63.35 per share of the Company’s common stock. If a Make-Whole Fundamental Change (as defined in the Indenture) occurs or becomes effective prior to the maturity date and a holder elects to convert its Notes in connection with the Make-Whole Fundamental Change, the Company is obligated to increase the conversion rate for the Notes so surrendered by a number of additional shares of the Company’s common stock as prescribed in the Indenture. Additionally, the conversion rate is subject to adjustment in the event of an equity restructuring transaction such as a stock dividend, stock split, spinoff, rights offering, or recapitalization through a large, nonrecurring cash dividend (“standard antidilution provisions,” per FASB ASC Topic 815-40, Contracts in Entity’s Own Equity ("ASC 815-40")).

The Notes are convertible at the option of the holders at any time prior to the close of business on the business day immediately preceding December 15, 2021 only under the following circumstances:

(i)

If during any calendar quarter commencing after the quarter ending September 30, 2015 (and only during such calendar quarter) the last reported sale price of the Company’s 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 immediately preceding calendar quarter is greater than 130% of the conversion price on each applicable trading day; or


(ii)	If during the 5 business day period after any 10 consecutive trading day period (the “measurement period”) in which the trading price per $1,000 of principal amount of Notes for each trading day of the measurement period was less than 98% of the product of the last report sale price of the Company’s common stock and the conversion rate on each such trading day; or


(iii)	Upon the occurrence of corporate events specified in the Indenture.

On or after December 15, 2021 until the close of business on the second scheduled trading day immediately preceding the maturity date, the holders may convert their Notes at any time, regardless of the foregoing circumstances. The Company may satisfy its conversion obligation by paying or delivering, as the case may be, cash, shares of the Company’s common stock, or a combination of cash and shares of the Company’s common stock, at the Company’s election and in the manner and subject to the terms and conditions provided in the Indenture.

Concurrently with the offering of the Notes and using a portion of the proceeds from the sale of the Notes, the Company entered into a series of convertible note hedge and warrant transactions (the “Note Hedge Transactions” and “Warrant Transactions”) which are designed to reduce the potential dilution to the Company’s stockholders and/or offset the cash payments the Company is required to make in excess of the principal amount upon conversion of the Notes. The Note Hedge Transactions and Warrant Transactions are separate transactions, in each case, entered into by the Company with a financial institution and are not part of the terms of the Notes. These transactions will not affect any holder’s rights under the Notes, and the holders of the Notes have no rights with respect to the Note Hedge Transactions and Warrant Transactions. See “Note 14. Stockholders’ Equity” for additional information.

At the June 30, 2015 issuance date of the Notes, the Company did not have the necessary number of authorized but unissued shares of its common stock available to share-settle the conversion option of the Notes. Therefore, in accordance with guidance found in FASB ASC Topic 470-20, Debt with Conversion and Other Options, and FASB Topic ASC 815-15, Embedded Derivatives, the conversion option of the Notes was deemed an embedded derivative requiring bifurcation from the Notes (host contract) and separate accounting as a derivative liability. The fair value of the conversion option derivative liability at June 30, 2015 was $167.0 million, which was recorded as a reduction to the carrying value of the debt and will be accreted to interest expense over the term of the debt using the effective interest method. Although the Company received stockholder approval on December 8, 2015 to amend the Company’s Restated Certificate of Incorporation to increase the authorized number of shares of the Company’s common stock (which amendment has occurred), the debt discount remains and continues to be accreted to interest expense. See “Note 14. Stockholders’ Equity” for additional information.

In connection with the issuance of the Notes, the Company incurred $18.7 million of debt issuance costs for banking, legal and accounting fees and other expenses. This amount was also recorded on the Company’s balance sheet as a reduction to the carrying value of the debt, in accordance with the Company’s early adoption of ASU No. 2015-03 - Simplifying the Presentation of Debt Issuance Costs (“ASU 2015-03”), and will be accreted to interest expense over the term of the debt using the effective interest method.

For the three months ended March 31, 2016, the Company recognized $8.3 million of interest expense related to the Notes, of which $3.0 million was cash and $5.3 million was non-cash accretion of the debt discounts recorded. As the Notes mature in 2022, they have been classified as long-term debt on the Company's consolidated balance sheets, with a carrying value of $429.9 million and $424.6 million as of March 31, 2016 and December 31, 2015, respectively. Accrued interest payable on the Notes of $3.5 million and $0.5 million as of March 31, 2016 and December 31, 2015, respectively, is included in accrued expenses on the Company's consolidated balance sheets.

Royal Bank of Canada $100.0 Million Revolver

On August 4, 2015, the Company entered into a senior secured revolving credit facility (the “Revolving Credit Facility”) of up to $100 million, pursuant to a credit agreement by and among the Company, the lenders party thereto from time to time and Royal Bank of Canada, as administrative agent and collateral agent (the “Revolving Credit Facility Agreement”). The Revolving Credit Facility is available for working capital and other general corporate purposes. Borrowings under the Revolving Credit Facility will accrue interest at a rate equal to LIBOR or the base rate, plus an applicable margin. The applicable margin may be increased or reduced by 0.75% based on the Company’s total net leverage ratio. The Revolving Credit Facility will mature on August 4, 2020. No borrowings have been drawn from the Revolving Credit Facility from its inception through March 31, 2016.

Loss on Early Extinguishment of Debt – Barclays $435.0 Million Term Loan

In connection with the acquisition of Tower during the first quarter of 2015, the Company entered into a $435.0 million senior secured term loan facility (the “Term Loan”) and a $50.0 million senior secured revolving credit facility (the “Barclays Revolver,” and collectively with the Term Loan, the “Barclays Senior Secured Credit Facilities”), pursuant to a credit agreement, dated as of March 9, 2015, by and among the Company, the lenders party thereto from time to time and Barclays Bank PLC ("Barclays"), as administrative and collateral agent (the “Barclays Credit Agreement”). In connection with the Barclays Senior Secured Credit Facilities, the Company incurred debt issuance costs for banking, legal and accounting fees and other expenses of $17.8 million, which were previously reflected as a discount to the carrying value of the debt on the Company’s consolidated balance sheet in accordance with ASU 2015-03. Prior to repayment of the Term Loan on June 30, 2015, this debt discount was accreted to interest expense over the term of the loan using the effective interest rate method.

On June 30, 2015, the Company used $436.4 million of the proceeds from the sale of the Notes to repay the $435.0 million of principal and $1.4 million of accrued interest due on its Term Loan under the Barclays Credit Agreement. In connection with this repayment of the loan, for the quarter ended June 30, 2015, the Company recorded a loss on early extinguishment of debt of $16.9 million related to the unaccreted portion of the debt discount.

For the three months ended March 31, 2015, the Company incurred total interest expense related to the Term Loan of $4.0 million, of which $3.8 million was cash and $0.2 million was non-cash accretion of the debt discount recorded. The cash interest expense includes a $2.3 million ticking fee paid to Barclays during the first quarter of 2015, prior to the funding of the Senior Secured Credit Facilities on March 9, 2015, to lock in the financing terms from the lenders' commitment of the Term Loan until the actual allocation of the loan occurred at the closing of the Tower acquisition.