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Debt (Narrative) (Details) (USD $) |  |  |  |  | 3 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2012 | Dec. 31, 2011 | Mar. 31, 2012 Senior Unsecured Notes [Member] | Feb. 01, 2012 Senior Unsecured Notes [Member] | Mar. 31, 2012 Senior Secured Credit Facility [Member] | Mar. 31, 2012 Senior Secured Credit Facility [Member] Letters Of Credit [Member] | Mar. 31, 2012 Inventory Sublimit [Member] Senior Secured Credit Facility [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |
Carrying value of senior unsecured notes | $ 350,981,000 | $ 250,000,000 |  |  |  |  |
Fair value of senior unsecured notes | 358,800,000 | 253,100,000 |  |  |  |  |
Debt instrument, principal amount |  |  | 350,000,000 | 100,000,000 |  |  |
Debt instrument, stated rate |  |  | 7.875% |  |  |  |
Debt instrument, percentage of face value |  |  |  | 101.00% |  |  |
Debt instrument, effective interest rate |  |  | 7.682% |  |  |  |
Credit facility, amount outstanding |  |  |  |  | 438,200,000 |  | 75,600,000
Credit facility, maximum borrowing capacity |  |  |  |  | 775,000,000 | 100,000,000 |
Credit facility, aggregate maximum borrowing capacity |  |  |  |  | 1,000,000,000 |  |
Letters of credit, outstanding amount |  |  |  |  |  | 4,900,000 |
Maturity date of debt |  |  |  |  | Jun. 30, 2015 |  |
Total amount available for borrowings under credit facility |  |  |  |  | $ 331,900,000 |  |

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- Definition The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, which may be presented in a variety of ways (year, month and year, day, month and year, quarter, etc.). + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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