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Shareholders' Equity (Details) (USD $) | 3 Months Ended | 12 Months Ended |  | 12 Months Ended |  | 3 Months Ended | 12 Months Ended |  |  | 1 Months Ended | 3 Months Ended |  | 12 Months Ended | 3 Months Ended | 12 Months Ended
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Dec. 31, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Common Stock [Member] | Dec. 31, 2011 Common Stock [Member] | Dec. 31, 2010 Common Stock [Member] | Jun. 30, 2009 Common Stock [Member] | Dec. 31, 2012 Series C Preferred Stock [Member] | Dec. 31, 2011 Series C Preferred Stock [Member] | Dec. 31, 2010 Series C Preferred Stock [Member] | Oct. 31, 2012 Series C Preferred Stock [Member] | Mar. 31, 2013 Series E Preferred Stock [Member] | Dec. 31, 2012 Series E Preferred Stock [Member] | Dec. 31, 2012 Series E Preferred Stock [Member] | Oct. 05, 2012 Series E Preferred Stock [Member] | Dec. 31, 2011 Series E Preferred Stock [Member] | Mar. 31, 2010 7.375% Series D Cumulative Redeemable Preferred Stock [Member] | Dec. 31, 2012 7.375% Series D Cumulative Redeemable Preferred Stock [Member] | Mar. 31, 2011 7.375% Series D Cumulative Redeemable Preferred Stock [Member] | Dec. 31, 2012 Series D Preferred Stock [Member] | Dec. 31, 2011 Series D Preferred Stock [Member] | Dec. 31, 2010 Series D Preferred Stock [Member] | Dec. 31, 2012 Cash Dividend Paid January 16, 2012 [Member] | Dec. 31, 2011 Accumulated Deficit [Member] | Dec. 31, 2010 Accumulated Deficit [Member] | Dec. 31, 2012 Accumulated Deficit [Member] Series C Preferred Stock [Member]
Shareholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized | 350,000,000 |  |  | 350,000,000 | 350,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public offering, shares issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ 0.01 |  |  | $ 0.01 | $ 0.01 |  |  |  |  |  | $ 0.01 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Liquidation Preference, Value |  |  |  |  |  |  |  |  |  |  |  | $ 250.00 |  |  |  | $ 115,000,000 |  |  |  |  | $ 25.00 |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuances of preferred stock |  |  |  | 166,720,000 | 0 | 229,347,000 |  |  |  |  |  |  |  |  |  |  |  |  | 166,636,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend rate (in thousandths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.625% |  |  |  |  |  | 7.375% |  |  |  |  |  |  |  |  |
Depositary shares, liquidation preference (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25.00 |  |  |  |  |  |  |
Depositary shares oustanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 18,150,000 |  |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) | $ 0.01 |  |  | $ 0.01 | $ 0.01 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Redemption Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 115,891,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends in arrears per share (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 18.4375 |  |  |  |  |  |  |  |
Dividends in arrears per depositary share (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.65625 |  |  |  |  |  | $ 1.84375 |  |  |  |  |  |  |  |
Dividends, Preferred Stock |  |  |  | 47,511,000 | 42,376,000 | 32,619,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 42,376,000 | 32,619,000 | 3,773,000
Proceeds from (Repayments of) Lines of Credit | 50,745,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares outstanding (in shares) |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 460,000 |  |  |  | 690,000 | 690,000 |  |  | 0 |  |  |  | 1,815,000 | 1,815,000 |  |  |  |  |
Dividends [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock cash dividends per share (in dollars per share) |  | $ 0.22 | $ 0.05 | $ 0.17 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.22 |  |  |
Dividends payable | $ 35,485,000 |  |  | $ 35,485,000 | $ 31,156,000 |  |  |  |  |  |  |  |  |  |  | $ 891,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares outstanding | 161,309,652 |  |  | 161,309,652 | 148,364,037 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible Assets Disclosure [Text Block] |  |  |  |  | December 31, 2011 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized | 15,000,000 |  |  | 15,000,000 | 15,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allocation of Dividends Declared and Paid |  |  |  |  |  |  | $ 0.83 | [1] | $ 0.84 | $ 0.80 |  | $ 14.53 | [2] | $ 19.38 | $ 19.38 |  |  |  | $ 3.91 | [3] |  |  |  |  |  | $ 18.44 | $ 18.44 | $ 18.44 |  |  |  |
[1] | Of the $0.22 per share dividend declared on November 18, 2012 and paid January 16, 2013, $0.17 per share is taxable in 2012 and $0.05 per share will be reported and is taxable in 2013.
[2] | Represents the three regular quarterly dividends paid in 2012, prior to the redemption on November 5, 2012.
[3] | Represents dividends for the partial quarter covering October 5, 2012 through December 31, 2012.

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- Definition The net cash inflow or cash outflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with either short term or long term maturity that is collateralized (backed by pledge, mortgage or other lien in the entity's assets). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -Subparagraph c -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3098-108585 + Details
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- Definition Number of new stock issued during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 -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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 4: 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 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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