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Earnings Per Share, Other Disclosures (Details) (USD $) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2012 | Mar. 31, 2010 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Warrant Transactions | Dec. 31, 2011 Warrant Transactions | Dec. 31, 2010 Warrant Transactions | Feb. 15, 2013 Warrant Transactions | Mar. 30, 2010 Warrant Transactions
Potential dilutive effect of options and Warrants |  |  |  |  |  |  |  |  |  |
Options outstanding to purchase common shares | 20,791 |  | 20,791 | 20,791 |  |  |  |  |  |
Average exercise price per share | $ 80.01 |  | $ 80.01 | $ 80.01 |  |  |  |  |  |
Potential dilutive effect of shares underlying the options |  |  | 0 | 0 | 0 |  |  |  |  |
Number of common shares underlying the Warrants outstanding |  |  |  |  |  | 3,600,000 |  |  |  | 3,600,000
Average exercise price of common shares underlying warrants |  |  |  |  |  | 61.31 |  |  | 61.25 |
Potential dilutive effect of shares underlying the Warrants |  |  |  |  |  | 0 | 0 | 0 |  |
Dividends |  |  |  |  |  |  |  |  |  |
Payment of cash dividends to stockholders |  |  | $ 19,600,000 | $ 18,900,000 | $ 19,000,000 |  |  |  |  |
Payment of quarterly cash dividends | $ 0.25 |  | $ 1.00 | $ 0.96 | $ 0.96 |  |  |  |  |
Treasury Stock, Number of Shares and Restriction Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |
Common shares available for additional share repurchase |  |  | 46,900,000 |  |  |  |  |  |  |
Repurchase of common shares authorized by Board |  |  | 0 | 0 | 0 |  |  |  |  |
Repurchase of common shares pursuant to a separate authorization from the Board, value |  | $ 44,200,000 |  |  |  |  |  |  |  |
Repurchase of common shares pursuant to a separate authorization from the Board, shares |  | 1,151,900 |  |  |  |  |  |  |  |

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