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Derivatives (Details Textual) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended |  |
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Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 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 |  |  |  |  | 5.705% |  |
Notional value of interest rate swap agreement |  |  |  |  |  |  | $ 50,000
Treasury Rate |  |  |  |  | 5.2175% |  |
Outstanding settlement payment due on Series F Agreement |  |  |  |  | 247 | 280 |
Derivatives (Additional Textual) [Abstract] |  |  |  |  |  |  |
Unrealized mark to market loss on interest rate protection agreement | 429 | 232 | 305 | 188 |  |  |
Settlement payments of mark to market gains or losses | 247 | 89 | 539 | 188 |  |  |
Amortization to be reclassified from OCI into Income |  |  | $ 2,369 |  |  |  |
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 Settlement payments of mark 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 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 percentage points added to the reference rate to compute the variable rate on the interest rate derivative. + References No definition available. + Details
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- Definition The estimated value of gains (losses), net anticipated to be transferred in the future from accumulated other comprehensive income into earnings. + References No definition available. + Details
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- Definition Aggregate notional amount of interest rate derivatives, which relates to the currency amount specified in the interest rate derivative instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579245-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959 + Details
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