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Preferred Stock, Common Stock and Dividends (Details) (USD $) | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 31, 2011 | Aug. 31, 2011 | May 31, 2011 | Apr. 30, 2011 | Mar. 31, 2011 | Feb. 28, 2011 | Apr. 30, 2009 | Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2011 year segment entity day trust semiannual quarter | Sep. 30, 2010 | Nov. 15, 2011 | Mar. 10, 2011 M | Dec. 31, 2010 | Apr. 07, 2009 M | Dec. 23, 2008
Preferred Stock, Common Stock and Dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series A cumulative perpetual preferred shares, issued (in shares) |  |  |  |  |  |  |  | 216,000 |  | 216,000 |  |  |  | 216,000 |  |
Series A Cumulative perpetual preferred shares, par value (in dollars per share) |  |  |  |  |  |  |  | $ 0.01 |  | $ 0.01 |  |  |  | $ 0.01 |  |
Series A Cumulative perpetual preferred shares, per share liquidation value (in dollars per share) |  |  |  |  |  |  |  | $ 1,000 |  | $ 1,000 |  |  |  | $ 1,000 |  |
Series A cumulative perpetual preferred shares, aggregate liquidation value |  |  |  |  |  |  |  | $ 216,000,000 |  | $ 216,000,000 |  |  |  |  |  |
Senior preferred stock, dividend rate for first five years (as a percent) |  |  |  |  |  |  |  |  |  | 5.00% |  |  |  |  |  |
Senior preferred stock, dividend rate thereafter (as a percent) |  |  |  |  |  |  |  |  |  | 9.00% |  |  |  |  |  |
Warrants to purchase entity's common stock (in shares) |  |  |  |  |  |  |  | 1,326,238 |  | 1,326,238 |  |  |  |  |  |
Warrants, exercise price (in dollars per share) |  |  |  |  |  |  |  | $ 24.43 |  | $ 24.43 |  |  |  |  |  |
Percentage of aggregate common stock investment on exercise of warrant to Senior Preferred Stock investment (as a percent) |  |  |  |  |  |  |  |  |  | 15.00% |  |  |  |  |  |
Warrants, term (in years) |  |  |  |  |  |  |  |  |  | 10 |  |  |  |  |  |
Senior preferred stock, dividend paid |  | 2,700,000 | 2,700,000 |  |  | 2,700,000 |  |  |  |  |  |  |  |  |  |
Senior preferred stock, future payment |  |  |  |  |  |  |  |  |  |  |  | 2,700,000 |  |  |  |
Series A cumulative perpetual preferred shares, fair value as if issued on a stand-alone basis |  |  |  |  |  |  |  | 130,900,000 |  | 130,900,000 |  |  |  |  |  |
Warrants, fair value as if issued on a stand-alone basis |  |  |  |  |  |  |  | 8,000,000 |  | 8,000,000 |  |  |  |  |  |
Series A Cumulative perpetual preferred shares, discount |  |  |  |  |  |  |  | 6,088,000 |  | 6,088,000 |  |  |  | 7,932,000 |  | 12,400,000
Period of amortization of discount on preferred shares (in years) |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  |  |
Amortization of discount on series A cumulative perpetual preferred shares |  |  |  |  |  |  |  | 624,000 | 586,000 | 1,844,000 | 1,731,000 |  |  |  |  |
Cash dividends paid to common shareholders (in dollars per share) | $ 0.19 |  |  | $ 0.19 |  |  |  |  |  |  |  |  |  |  |  |
Semi annual cash dividend payable, maximum (in dollars per share) |  |  |  |  |  |  | $ 0.33 |  |  |  |  |  |  |  |  |
Repurchase of common stock, authorized amount |  |  |  |  | 40,000,000 |  | 40,000,000 |  |  |  |  |  |  |  |  |
Period of repurchase of common stock (in months) |  |  |  |  |  |  |  |  |  |  |  |  | 12 |  | 12 |
Cumulative number of shares repurchased under all stock repurchase programs (in shares) | 7,747,827 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative cost of shares repurchased under all stock repurchase programs | $ 235,819,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Discount on preferred shares, or any unamortized balance thereof, shown separately as a deduction from the applicable account(s) as circumstances require. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187103-122770 + Details
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- Definition The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 5 -Section 02 -Paragraph 29 Reference 4: 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.(d)(1)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 4 -Section 08 -Paragraph d Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 4, 6 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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