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Debt Senior Notes (Details) (USD $) | 3 Months Ended | 9 Months Ended |  | 1 Months Ended |  |  | 3 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2012 | Sep. 30, 2012 | Dec. 31, 2011 | Apr. 30, 2012 2012 Senior Notes [Member] | Sep. 30, 2012 2012 Senior Notes [Member] | Sep. 30, 2012 2018 Senior Notes [Member] | May 08, 2012 2018 Senior Notes [Member] | Sep. 30, 2012 2017 Convertible Senior Notes [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Ratio | 42.0159 |  |  |  |  |  |  | 42.0159
Debt Instrument Convertible Principal Amount Used In Conversion Rate Calculation | $ 1,000 | $ 1,000 |  |  |  |  |  | $ 1,000
Debt Instrument, Convertible, Conversion Price | $ 23.80 | $ 23.80 |  |  |  |  |  | $ 23.80
Repayments of Senior Notes |  | (41,443,000) |  | 41,443,000 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 6.875% | 8.625% |  | 3.25%
Senior Notes, Increase Additional borrowing |  |  |  |  |  |  | 30,000,000 |
Senior notes | 227,570,000 | 227,570,000 | 239,016,000 |  |  | 230,000,000 | 200,000,000 | 57,500,000
Preferred Stock, Dividend Rate, Percentage |  | 9.75% |  |  |  |  |  |
Restricted Payments Basket | $ 36,601,000 | $ 36,601,000 |  |  |  |  |  |

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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 SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 2: 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 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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