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Earnings per Share Earnings per Share (Textuals) (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Earnings Per Share [Abstract] |  |  |  |
Convertible senior subordinated notes | $ 57,500,000 | $ 57,500,000 | $ 0 |
Debt Instrument, Convertible, Conversion Ratio | 42.0159 |  |  |
Debt Instrument Convertible Principal Amount Used In Conversion Rate Calculation | 1,000 | 1,000 |  |
Debt Instrument, Convertible, Conversion Price | $ 23.80 | $ 23.80 |  |
Stock Issued During Period, Shares, Other | 2,400,000 |  |  |
Stock Issued During Period, Shares, New Issues | 2,530,000 |  |  |
StockIssuedDuringPeriodPricePerShare | $ 17.63 |  |  |
Proceeds from Issuance of Common Stock | $ 42,100,000 | $ 42,085,000 | $ 0 | $ 0
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount |  | 739,296 |  |

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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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