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Debt Obligations (Details Textuals) (USD $) |  |  |  |  |  | 12 Months Ended |  |  |  | 0 Months Ended |  |  |  |  |  | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2011 Secured Debt [Member] | Dec. 31, 2010 Secured Debt [Member] | Dec. 31, 2009 Secured Debt [Member] | Dec. 31, 2011 Unsecured Debt [Member] | Dec. 31, 2010 Unsecured Debt [Member] | Dec. 15, 2011 Unsecured Debt [Member] | Dec. 31, 2011 Letter of Credit [Member] Unsecured Debt [Member] | Dec. 15, 2011 Credit Facility [Member] | Jun. 29, 2011 Bank Term Loan and the Credit Facility [Member] | Dec. 31, 2011 Bank Term Loan and the Credit Facility [Member] | Dec. 31, 2011 $345.0M 3.875% Guaranteed Exchangeable Notes due 2026 [Member] | Dec. 31, 2011 $345.0M 3.875% Guaranteed Exchangeable Notes due 2026 [Member] Unsecured Debt [Member] | Oct. 20, 2011 $345.0M 3.875% Guaranteed Exchangeable Notes due 2026 [Member] Unsecured Debt [Member] | Sep. 30, 2011 $345.0M 3.875% Guaranteed Exchangeable Notes due 2026 [Member] Unsecured Debt [Member] | Dec. 31, 2011 $300.0M 5.750% Guaranteed Notes due 2012 [Member] Unsecured Debt [Member] | Dec. 31, 2011 $250.0M 5.400% Guaranteed Notes due 2014 [Member] Unsecured Debt [Member] | Dec. 31, 2011 $250.0M 7.500% Guaranteed Notes due 2015 [Member] Unsecured Debt [Member] | Dec. 31, 2011 $250.0M 6.000% Guaranteed Notes due 2016 [Member] Unsecured Debt [Member] | Dec. 31, 2011 $300.0M 5.700% Guaranteed Notes due 2017 [Member] Unsecured Debt [Member] | Dec. 31, 2011 $325.0M 4.950% Guaranteed Notes due 2018 [Member] Unsecured Debt [Member] | Mar. 31, 2011 $325.0M 4.950% Guaranteed Notes due 2018 [Member] Unsecured Debt [Member] | Dec. 31, 2011 One Logan Square [Member] Secured Debt [Member]
Debt obligations (Textuals) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  | $ 600,000,000 |  |  |  |  |  | $ 345,000,000 |  |  | $ 300,000,000 | $ 250,000,000 | $ 250,000,000 | $ 250,000,000 | $ 300,000,000 | $ 325,000,000 |  |
Interest rate floor on a monthly basis |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.50%
Initial Maturity Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Oct. 20, 2011 |  |  |  |  |  |  |  |
Extended Maturity date |  |  |  |  |  |  |  |  |  |  |  | Jun. 29, 2012 |  |  |  |  |  |  |  |  |  |  |  |
Guaranteed Exchangeable Notes tendered and accepted for purchase |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 59,500,000 |  |  |  |  |  |  |  |  |
Outstanding balance remaining after redeem notes at par plus accrued and unpaid interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 400,000 |  |  |  |  |  |  |  |  |
Debt Instrument, Extension Fee Amount |  |  |  |  |  |  |  |  |  |  | 1,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Basis points of the outstanding principal balance related to debt extension fee |  |  |  |  |  |  |  |  |  |  | 1.50% |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum amount by which the Company may increase its credit facility |  |  |  |  |  |  |  |  |  | 600,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Option for additional borrowings subject to customary conditions and limitations |  |  |  |  |  |  |  |  |  | 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings under the credit facility |  |  |  |  |  | 275,500,000 |  |  | 2,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unused availability under the Credit Facility |  |  |  |  |  | 322,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average effective interest rate |  |  | 6.72% | 6.59% | 6.45% | 0.99% | 1.03% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Properties encumbered mortgage indebtedness carrying value, net | 678,000,000 | 989,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average interest rate on the Credit Facility |  |  |  |  |  | 1.01% | 1.02% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument stated interest rate |  |  |  |  |  |  |  |  |  |  |  |  | 3.875% | 3.875% |  |  | 5.75% | 5.40% | 7.50% | 6.00% | 5.70% | 4.95% | 4.95% |
Carrying amount of the equity component |  |  |  |  |  |  |  |  |  |  |  |  | $ 24,400,000 |  |  |  |  |  |  |  |  |  |  |

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- Definition The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031897-161870 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number APB14-1 -Paragraph 31 -Subparagraph a -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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- Definition The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 Reference 3: 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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