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Subsequent Events (Details) (USD $) | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Apr. 19, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Apr. 15, 2013
Subsequent Events (Textuals) [Abstract] |  |  |  |
Cash dividend declared per common share | $ 0.30 |  |  |
Conversion price per share of note |  | $ 48.24 |  | $ 48.19
Stock repurchase program, authorized amount by Board of Directors | $ 75,000,000 |  |  |
Repurchase of common stock, shares | 210,835 | 259,596 |  |
Weighted-average price per share of common stock repurchased | $ 60.94 | $ 62.62 |  |
Common share amount available for additional share repurchase | 92,800,000 | 30,700,000 | 46,900,000 |
Dividend declared |  |  |  |
Subsequent Events (Textuals) [Abstract] |  |  |  |
Subsequent event amount | 5,800,000 |  |  |
Convertible Notes |  |  |  |
Subsequent Events (Textuals) [Abstract] |  |  |  |
Conversion rate of common stock shares per $1,000 of principal amount | 20.7522 | 20.7309 |  |
Principal amount in conversion feature |  | $ 1,000 |  | $ 1,000
Call Options |  |  |  |
Subsequent Events (Textuals) [Abstract] |  |  |  |
Exercise price per share of call options |  | $ 48.24 |  | $ 48.19
Warrants |  |  |  |
Subsequent Events (Textuals) [Abstract] |  |  |  |
Exercise price per share of Warrants |  | 61.25 |  | 61.19

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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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