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Debt Obligations (Details Textuals 2) (USD $) In Millions, unless otherwise specified |  | 3 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2011 Bank Term Loan And The Credit Facility [Member] Federal Funds Rate [Member] | Mar. 31, 2011 Unsecured Debt [Member] | Mar. 31, 2012 Unsecured Debt [Member] Seven Year Term Loan [Member] | Mar. 31, 2012 Unsecured Debt [Member] Three and Four Year Term Loan [Member] | Mar. 31, 2012 Secured Debt [Member] | Mar. 31, 2011 Secured Debt [Member]
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term Debt, Weighted Average Interest Rate |  | 0.99% |  |  | 6.72% | 6.59%
Line of Credit Facility, Interest Rate During Period |  | 1.02% |  |  |  |
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 Declining prepayment penalty in Year One + References No definition available. + Details
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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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- Definition Aggregate notional amount of all interest rate derivatives designated as hedging instruments in cash flow hedges. Notional amount refers to the monetary amount specified in the interest rate derivative contract. + References Reference 1: 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=6935481&loc=SL5580258-113959 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 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5579245-113959 + Details
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