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Stockholders' Equity (Details 1) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2012 | Mar. 31, 2011
Dividend Distributions |  |
Total Dividend | $ 4,762 | $ 4,927
Series F Preferred Stock [Member] |  |
Dividend Distributions |  |
Dividend/Distribution per Share | $ 1,369 |
Total Dividend | 685 |
Series G Preferred Stock [Member] |  |
Dividend Distributions |  |
Dividend/Distribution per Share | $ 1,809 |
Total Dividend | 452 |
Series J Preferred Stock [Member] |  |
Dividend Distributions |  |
Dividend/Distribution per Share | $ 4,531 |
Total Dividend | 2,719 |
Series K Preferred Stock [Member] |  |
Dividend Distributions |  |
Dividend/Distribution per Share | $ 4,531 |
Total Dividend | $ 906 |

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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AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 14 -Subparagraph l -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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- Definition Aggregate dividends declared during the period for each share of preferred stock outstanding. + References No definition available. + Details
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