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Earnings Per Share, Other Disclosures (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2012 | Mar. 31, 2011 | Dec. 31, 2011
Potential dilutive effect of options and Warrants |  |  |
Options outstanding to purchase common shares | 20,791 |  | 20,791
Average exercise price per share | $ 80.01 |  | $ 80.01
Potential dilutive effect of shares underlying the options | 0 | 0 |
Number of common shares underlying the Warrants outstanding | 3,600,000 |  |
Average Exercise price of common shares underlying warrants | 61.35 |  |
Potential dilutive effect of shares underlying the Warrants | 0 | 0 |
Dividends |  |  |
Payment of cash dividends to stockholders | $ 4.9 | $ 4.7 |
Cash dividend paid per share | $ 0.25 | $ 0.24 |

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