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Derivatives (Details Textual) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2012 | Mar. 31, 2011 | Mar. 31, 2012 Series F Preferred Stock [Member] | Dec. 31, 2011 Series F Preferred Stock [Member] | Oct. 31, 2008 Series F Preferred Stock [Member]
Derivatives (Textual) [Abstract] |  |  |  |  |
Minimum fixed coupon rate of preferred stock |  |  | 2.375% |  |
Number of years of U.S treasury rate one |  |  | 30 years |  |
Number of years of U.S treasury rate two |  |  | 10 years |  |
LIBOR rate |  |  | 3 month LIBOR |  |
New coupon rate of preferred stock |  |  | 5.415% |  |
Notional value of interest rate swap agreement |  |  |  |  | $ 50,000
Treasury Rate |  |  | 5.2175% |  |
Outstanding payable due on Series F Agreement |  |  | 292 | 280 |
Derivatives (Additional Textual) [Abstract] |  |  |  |  |
Unrealized market to market loss on interest rate protection agreement | 0 |  |  |  |
Amortization Reclassified from OCI into Income | 2,308 |  |  |  |
Unrealized mark to market gain on interest rate protection agreement | 124 | 44 |  |  |
Settlements payments of market to market gains or losses | $ 292 | $ 99 |  |  |
Number of years of Long dated Treasuries | 30 years |  |  |  |

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- Definition Number of years of Long dated Treasuries. + References No definition available. + Details
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- Definition One of three rates for which the highest of the three rates is the adjustable component of the dividend rate which is added to the fixed component to determine the overall dividend rate. + References No definition available. + Details
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- Definition One of three rates for which the highest of the three rates is the adjustable component of the dividend rate which is added to the fixed component to determine the overall dividend rate. + References No definition available. + Details
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- Definition Outstanding payable due on Series F Agreement. + References No definition available. + Details
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- Definition Settlements payments of market to market gains or losses. + References No definition available. + Details
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- Definition Percentage of treasury rate. + References No definition available. + Details
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- Definition Unrealized mark to market gain on interest rate protection agreement. + References No definition available. + Details
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- Definition Unrealized mark to market loss on interest rate protection agreement. + References No definition available. + Details
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- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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- Definition The effective portion of loss reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph b -Clause 3 -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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