Long-Term Debt and Credit Facility

Senior Notes

On May 23, 2012, the Company issued $225.0 principal amount of 8.250% Senior Notes due June 1, 2020 (the “Senior Notes”) at par. Interest expense, including amortization of deferred financing costs, relating to the Senior Notes was $4.8 and $14.5 for the quarter and nine months ended September 30, 2013, respectively. Interest expense, including amortization of deferred financing costs, relating to the Senior Notes was $4.9 and $7.0 for the quarter and nine months ended September 30, 2012, respectively, of which a portion is capitalized as Construction in progress. See Note 3 of Notes to Consolidated Financial Statements included in Part II, Item 8. “Financial Statements and Supplementary Data” in the Company’s Annual Report Form 10-K for the year ended December 31, 2012 for additional information regarding the Senior Notes.

Cash Convertible Senior Notes

Convertible Notes. In March 2010, the Company issued $175.0 principal amount of 4.5% Cash Convertible Senior Notes due April 1, 2015 (the “Convertible Notes”). The Convertible Notes are not convertible into the Company's common stock or any other securities, but instead will be settled in cash. The Company accounts for the cash conversion feature of the Convertible Notes as a separate derivative instrument (the “Bifurcated Conversion Feature”) with the fair value on the issuance date equaling the original issue discount for purposes of accounting for the debt component of the Convertible Notes. The following tables provide additional information regarding the Convertible Notes:



	September 30, 2013			December 31, 2012
Principal amount	$	175.0		$	175.0
Less: unamortized issuance discount	(13.6		)	(19.7		)
Carrying amount, net of discount	$	161.4		$	155.3



	Quarter Ended September 30,				Nine Months Ended September 30,
	2013		2012		2013		2012
Contractual coupon interest	$	2.0	$	2.0	$	5.9	$	5.9
Amortization of discount	2.0		1.9		6.0		5.4
Amortization of deferred financing costs	0.3		0.3		0.9		0.9
Total interest expense¹	$	4.3	$	4.2	$	12.8	$	12.2

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¹	A portion of the interest relating to the Convertible Notes is capitalized as Construction in progress.

The Convertible Notes’ conversion rate is subject to adjustment based on the occurrence of certain events. As of September 30, 2013, the conversion rate was 20.7714 shares per $1,000 principal amount of the Convertible Notes and the equivalent conversion price was approximately $48.14 per share, reflecting cumulative adjustments for quarterly dividends paid in excess of $0.24 per share.

Holders may convert their Convertible Notes at any time on or after January 1, 2015. Additionally, holders may convert the Convertible Notes before January 1, 2015 in certain limited circumstances determined by (i) the trading price of the Convertible Notes, (ii) the occurrence of specified corporate events, or (iii) the market price of the Company's common stock. Because the Company's closing stock price exceeded 130% of the conversion price for 20 trading days during a period of 30 consecutive trading days ending on September 30, 2013, the last trading date of the third quarter of 2013, holders may convert the Convertible Notes during the fourth quarter of 2013. The Company believes that the market value of the Convertible Notes will continue to exceed the amount of cash payable upon conversion, making early conversion unlikely. As of September 30, 2013, no Convertible Notes had been converted.

Convertible Note Hedge Transactions. In March 2010, the Company purchased cash settled call options (the “Call Options”) that have an exercise price equal to the conversion price of the Convertible Notes and an expiration date that is the same as the maturity or on the earlier conversion date of the Convertible Notes. If the Company exercises the Call Options, the aggregate amount of cash it would receive from the counterparties to the Call Options would equal the aggregate amount of cash that the Company would be required to pay to the holders of the converted Convertible Notes, less the principal amount thereof. Contemporaneous with the purchase of the Call Options, the Company also sold net-share-settled warrants (the “Warrants”) with an exercise date of July 1, 2015 relating to approximately 3.6 million shares of the Company’s common stock. At September 30, 2013, the exercise prices were $48.14 per share and $61.14 per share for the Call Options and the Warrants, respectively, reflecting cumulative adjustments for quarterly dividends paid in excess of $0.24 per share.

See Note 3 of Notes to Consolidated Financial Statements included in Part II, Item 8. “Financial Statements and Supplementary Data” in the Company’s Annual Report on Form 10-K for the year ended December 31, 2012 for additional information regarding the Convertible Notes, the Call Options and the Warrants.

See “Fair Values of Financial Assets and Liabilities - All Other Financial Assets and Liabilities” in Note 10 for information relating to the estimated fair value of the Senior Notes and Convertible Notes.

Revolving Credit Facility

The Company’s credit agreement with JPMorgan Chase Bank, N.A., as administrative agent, and the other financial institutions party thereto (the “Revolving Credit Facility”) provides the Company with a $300.0 funding commitment through September 30, 2016. The Company had $263.9 of borrowing availability under the Revolving Credit Facility at September 30, 2013, based on the borrowing base determination then in effect. At September 30, 2013, there were no borrowings under the Revolving Credit Facility and $6.9 was being used to support outstanding letters of credit, leaving $257.0 of net borrowing availability. The interest rate applicable to any overnight borrowings under the Revolving Credit Facility would have been 4.0% at September 30, 2013.

See Note 4 of Notes to Consolidated Financial Statements included in Part II, Item 8. “Financial Statements and Supplementary Data” in the Company’s Annual Report on Form 10-K for the year ended December 31, 2012 for additional information regarding the Revolving Credit Facility.