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Subsequent Events (Details) (USD $) | 3 Months Ended |  |  | 3 Months Ended | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2013 | Feb. 15, 2013 | Dec. 31, 2012 | Mar. 31, 2013 Dividend declared | Feb. 15, 2013 Convertible Notes | Dec. 31, 2012 Convertible Notes | Feb. 15, 2013 Call Options | Dec. 31, 2012 Call Options | Feb. 15, 2013 Warrants | Dec. 31, 2012 Warrants
Subsequent Events (Textuals) [Abstract] |  |  |  |  |  |  |  |  |  |
Cash dividend declared per common share | $ 0.30 |  |  |  |  |  |  |  |  |
Subsequent event amount |  |  |  | $ 5,900,000 |  |  |  |  |  |
Conversion rate of common stock shares per $1,000 of principal amount |  |  |  |  | 20.7309 | 20.7111 |  |  |  |
Principal amount in conversion feature |  |  |  |  | $ 1,000 | $ 1,000 |  |  |  |
Conversion price of note |  | $ 48.24 | $ 48.28 |  |  |  |  |  |  |
Exercise price of call options |  |  |  |  |  |  | $ 48.24 | $ 48.28 |  |
Exercise price per share of Warrants |  |  |  |  |  |  |  |  | 61.25 | 61.31

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- Definition The exercise price of each class of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Subparagraph 4 -Article 4 + Details
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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770 + Details
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