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Debt Obligations (Details Textuals 2) (USD $) In Millions, unless otherwise specified |  | 3 Months Ended | 6 Months Ended |  |
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Jun. 30, 2012 Bank Term Loan And The Credit Facility [Member] Federal Funds Rate [Member] | Jun. 30, 2011 Unsecured Debt [Member] | Jun. 30, 2012 Unsecured Debt [Member] Seven Year Term Loan [Member] | Jun. 30, 2012 Unsecured Debt [Member] Three and Four Year Term Loan [Member] | Jun. 30, 2012 Secured Debt [Member] | Jun. 30, 2011 Secured Debt [Member]
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term Debt, Weighted Average Interest Rate |  | 1.01% |  |  | 6.72% | 6.59%
Line of Credit Facility, Interest Rate During Period |  | 0.99% |  |  |  |
Declining prepayment penalty in year one |  |  | 3.00% |  |  |
Declining prepayment penalty in year two |  |  | 2.00% |  |  |
Declining prepayment penalty in year three |  |  | 1.00% |  |  |
Debt instrument, basis spread on variable rate | 0.50% |  | 1.90% |  |  |
Derivative, Average Fixed Interest Rate |  |  | 3.623% |  |  |
Notional amount of interest rate cash flow hedge derivatives |  |  |  | $ 300.0 |  |
Derivative, lower fixed interest rate range |  |  |  | 2.47% |  |
Derivative, higher fixed interest rate range |  |  |  | 2.91% |  |
Derivative, lower remaining maturity range |  |  |  | 3 years |  |
Derivative, higher remaining maturity range |  |  |  | 5 years |  |

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- Definition Average fixed interest rate related to the group of interest rate derivatives. + References No definition available. + Details
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- Definition The effective interest rate during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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