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Debt Senior Notes (Details) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2012
Debt Instrument [Line Items] |  |  |
Senior notes | $ 227,770,000 |  | $ 227,670,000
Preferred Stock, Dividend Rate, Percentage | 9.75% |  |
Restricted Payments Basket | 95,704,000 |  |
Preferred shares redeemed during period | 2,000 |  |
Reclassification of preferred shares subject to redemption | 50,352,000 | 0 |
2018 Senior Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 8.625% |  |
Senior notes | 230,000,000 |  |
2017 Convertible Senior Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Convertible Subordinated Debt | 57,500,000 |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.25% |  |
Debt Instrument, Convertible, Conversion Ratio | 42.0159 |  |
Debt Instrument Convertible Principal Amount Used In Conversion Rate Calculation | 1,000 |  |
Debt Instrument, Convertible, Conversion Price | $ 23.80 |  |
Stock Issued During Period, Shares, Other | 2,400,000 |  |
2018 Convertible Senior Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Convertible Subordinated Debt | 86,250,000 |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.00% |  |
Debt Instrument, Convertible, Conversion Ratio | 30.9478 |  |
Debt Instrument Convertible Principal Amount Used In Conversion Rate Calculation | $ 1,000 |  |
Debt Instrument, Convertible, Conversion Price | $ 32.31 |  |
Stock Issued During Period, Shares, Other | 2,700,000 |  |

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- Definition Including the current and noncurrent portions, the carrying value of convertible subordinated debt, as of the balance sheet date, initially scheduled to be repaid after one year or beyond the normal operating cycle if longer. This form of debt can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder, and places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Article 5 -Subsection 20, 22 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX210.5-02.22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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