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Long-Term Debt and Credit Facility | 6 Months Ended
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Jun. 30, 2013
Debt Disclosure [Abstract] |
Long-Term Debt | 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 $9.6 for the quarter and six months ended June 30, 2013, respectively. Interest expense, including amortization of deferred financing costs, relating to the Senior Notes was $2.1 for both the quarter and six months ended June 30, 2012. 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:
| June 30, 2013 |  | December 31, 2012
Principal amount | $ | 175.0 |  |  | $ | 175.0 |
Less: unamortized issuance discount | (15.7 | ) |  | (19.7 | )
Carrying amount, net of discount | $ | 159.3 |  |  | $ | 155.3 |
| Quarter Ended June 30, |  | Six Months Ended June 30,
| 2013 |  | 2012 |  | 2013 |  | 2012
Contractual coupon interest | $ | 1.9 |  |  | $ | 1.9 |  |  | $ | 3.9 |  |  | $ | 3.9 |
Amortization of discount and deferred financing costs | 2.4 |  |  | 2.1 |  |  | 4.6 |  |  | 4.1 |
Total interest expense 1 | $ | 4.3 |  |  | $ | 4.0 |  |  | $ | 8.5 |  |  | $ | 8.0 |
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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 June 30, 2013, the conversion rate was 20.7522 shares per $1,000 principal amount of the Convertible Notes and the equivalent conversion price was approximately $48.19 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 June 28, 2013, the last trading date of the second quarter of 2013, holders may convert the Convertible Notes during the third quarter of 2013. However, 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. 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 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 June 30, 2013, the exercise prices were $48.19 per share and $61.19 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 $266.4 of borrowing availability under the Revolving Credit Facility at June 30, 2013, based on the borrowing base determination then in effect. At June 30, 2013, there were no borrowings under the Revolving Credit Facility and $7.0 was being used to support outstanding letters of credit, leaving $259.4 of net borrowing availability. The interest rate applicable to any overnight borrowings under the Revolving Credit Facility would have been 4.0% at June 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.

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- Definition The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20,22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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