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Stockholders' Equity (Details 1) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |
Dividend/Distribution per Share/ Unit, common stock |  |  |  |  |  |  |  |  | $ 0.00 | $ 0.00 | $ 0.00
Total Dividend/Distribution, preferred stock | $ 4,763 | $ 4,928 | $ 4,947 | $ 4,927 | $ 4,854 | $ 4,884 | $ 4,979 | $ 4,960 | $ 19,565 | $ 19,677 | $ 19,516
Series F Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |
Dividend/Distribution per Share/ Unit, preferred stock |  |  |  |  |  |  |  |  | $ 6,511 | $ 6,736 | $ 6,415
Total Dividend/Distribution, preferred stock |  |  |  |  |  |  |  |  | 3,256 | 3,368 | 3,207
Series G Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |
Dividend/Distribution per Share/ Unit, preferred stock |  |  |  |  |  |  |  |  | $ 7,236 | $ 7,236 | $ 7,236
Total Dividend/Distribution, preferred stock |  |  |  |  |  |  |  |  | 1,809 | 1,809 | 1,809
Series J Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |
Dividend/Distribution per Share/ Unit, preferred stock |  |  |  |  |  |  |  |  | $ 18,125 | $ 18,125 | $ 18,125
Total Dividend/Distribution, preferred stock |  |  |  |  |  |  |  |  | 10,875 | 10,875 | 10,875
Series K Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |
Dividend/Distribution per Share/ Unit, preferred stock |  |  |  |  |  |  |  |  | $ 18,125 | $ 18,125 | $ 18,125
Total Dividend/Distribution, preferred stock |  |  |  |  |  |  |  |  | $ 3,625 | $ 3,625 | $ 3,625

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- Definition Equity impact of aggregate cash, stock, and paid-in-kind dividends declared for preferred shareholders during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817 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 AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 14 -Subparagraph l -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 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 + Details
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