7. Long-Term Debt

Our long-term debt consists of:

(In thousands)	June 30, 2016			December 31, 2015
Convertible Subordinated Notes due 2023	$	245,109		$	255,109
Non-Recourse Notes Payable due 2029	494,017			493,162

Total long-term debt	739,126			748,271
Unamortized debt issuance costs	(13,573		)	(15,140		)
Current portion of long-term debt	(3,266		)	—

Net long-term debt	$	722,287		$	733,131

Convertible Subordinated Notes Due 2023

In January 2013, we completed an underwritten public offering of $287.5 million aggregate principal amount of unsecured convertible subordinated notes, which will mature on January 15, 2023 (the “2023 Notes”). The financing raised proceeds, net of issuance costs, of approximately $281.2 million, less $36.8 million to purchase two privately-negotiated capped call option transactions in connection with the issuance of the notes. The 2023 Notes bear interest at the rate of 2.125% per year that is payable semi-annually in arrears in cash on January 15 and July 15 of each year, beginning on July 15, 2013.

The 2023 Notes were convertible, at the option of the holder, into shares of our common stock at an initial conversion rate of 35.9903 shares per $1,000 principal amount of the 2023 Notes, subject to adjustment in certain circumstances, which represents an initial conversion price of approximately $27.79 per share. Following the Spin-Off of Theravance Biopharma, a number of adjustments to the initial conversion rate have been made as described below. Holders of the 2023 Notes will be able to require us to repurchase some or all of their notes upon the occurrence of a fundamental change, as defined in the 2013 Notes, at 100% of the principal amount of the notes being repurchased plus accrued and unpaid interest. We may not redeem the notes prior to their stated maturity date.

In connection with the offering of the 2023 Notes, we entered into two privately-negotiated capped call option transactions with a single counterparty. The capped call option transaction is an integrated instrument consisting of a call option on our common stock purchased by us with a strike price equal to the initial conversion price of $27.79 per share for the underlying number of shares and a cap price of $38.00 per share, both of which are subject to adjustments consistent with the 2023 Notes. The cap component is economically equivalent to a call option sold by us for the underlying number of shares with an initial strike price of $38.00 per share. As an integrated instrument, the settlement of the capped call coincides with the due date of the convertible debt. Upon settlement, we would receive from our hedge counterparty a number of shares of our common shares that would range from zero, if the stock price was below $27.79 per share, to a maximum of 2,779,659 shares, if the stock price is above $38.00 per share. However, if the market price of our common stock, as measured under the terms of the capped call transactions, exceeds $38.00 per share, there is no incremental anti-dilutive benefit from the capped call.

In accordance with the agreement for the 2023 Notes, the conversion rate was adjusted as a result of the completion of the Spin-Off of Theravance Biopharma. The conversion rate was adjusted based on the conversion rate immediately prior to the record date for the Spin-Off and the average of the stock dividend distributed to our common stockholders and our stock prices. This resulted in an adjusted conversion rate of 46.9087 shares per $1,000 principal amount of the 2023 Notes, which represents an adjusted conversion price of approximately $21.32 per share. As a result of the conversion rate adjustment, the capped call strike price and cap price were also adjusted accordingly to $21.32 and $29.16, respectively. On July 15, 2014, certain holders of the 2023 Notes converted their notes into 1,519,402 shares of our common stock at the adjusted conversion price of $21.32 per share. In connection with the partial conversion of the 2023 Notes, we received 149,645 shares of our common stock from our capped call option counterparty and the shares of common stock received were recorded as treasury stock.

In connection with the payments of the cash dividends during the years ended December 31, 2015 and 2014, the adjusted conversion rate with respect to our 2023 Notes was further adjusted in total from 46.9087 shares of our common stock per $1,000 principal amount of the 2023 Notes to 50.5818 shares of our common stock per $1,000 principal amount of the 2023 Notes, which represents an adjusted conversion price of approximately $19.77 per share. As a result of the conversion rate adjustment, the capped call strike price and cap price were also adjusted accordingly to $19.77 and $27.04.

In May 2016, we retired a portion of our 2023 Notes with a face value of $10.0 million and carrying value of $9.8 million by way of purchase in the open market. The 2023 Notes were purchased for a total settlement price of $8.1 million resulting in a gain of $1.7 million, which is included in other income (expense), net in the condensed consolidated statement of operations. As a result of the partial retirement of our 2023 Notes, we entered into a partial termination agreement of the capped call option transaction described above. The partial termination agreement of the capped call option transaction enabled us to receive $0.4 million from the counterparty, which was recorded as an increase in additional paid-in capital in our condensed consolidated balance sheet as of June 30, 2016.

Non-Recourse Notes Due 2029

In April 2014, we entered into certain note purchase agreements relating to the private placement of $450.0 million aggregate principal amount of non-recourse fixed rate term notes due 2029 (the “2029 Notes”) issued by our wholly-owned subsidiary.

The 2029 Notes bear an annual interest rate of 9%, with interest and principal paid quarterly beginning November 15, 2014. The 2029 Notes may be redeemed at any time prior to maturity, in whole or in part, at specified redemption premiums. Prior to and including May 15, 2016, in the event that the specified portion of royalties received in a quarter was less than the interest accrued for the quarter, the principal amount of the 2029 Notes was increased by the interest shortfall amount for that period, and considered as payment in kind (“PIK”). Since issuance, $44.0 million of interest expense has been added to the principal balance of the 2029 Note, of which $0.2 million and $0.9 million was added during the three and six months ended June 30, 2016, respectively, and $6.4 million and $12.8 million was added during the three and six months ended June 30, 2015, respectively. Since the principal and interest payments on the 2029 Notes are based on royalties from product sales recorded by GSK, which will vary from quarter to quarter and are unknown to us, the 2029 Notes may be repaid prior to the final maturity date in 2029. The 2029 Notes can be prepaid subject to a prepayment premium of 2.5% until April 17, 2017, and without premium afterwards.

As of June 30, 2016, the principal balance of the 2029 Notes was $494.0 million, which will be partially paid down by $3.3 million in the next quarterly payment expected to be made in August 2016. This payment is based on our royalty revenues of $35.7 million for the three months ended June 30, 2016.