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Debt Obligations (Details Textuals 1) (USD $) | 12 Months Ended |  |  |  |  |  |  |
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Jun. 30, 2011 Research Office Center [Member] | Sep. 30, 2011 Concord Airport Plaza [Member] | Dec. 31, 2011 $345.0M 3.875% Guaranteed Exchangeable Notes due 2026 [Member] | Dec. 31, 2011 Unsecured Debt [Member] | Dec. 15, 2011 Unsecured Debt [Member] | Dec. 31, 2010 Unsecured Debt [Member] | Dec. 31, 2011 Unsecured Debt [Member] $345.0M 3.875% Guaranteed Exchangeable Notes due 2026 [Member] | Dec. 31, 2010 Unsecured Debt [Member] $345.0M 3.875% Guaranteed Exchangeable Notes due 2026 [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  | $ 600,000,000 |  | $ 345,000,000 |  |
Debt instrument stated interest rate |  |  |  |  |  | 3.875% |  |  |  | 3.875% |  |
Unamortized fixed-rate debt premium |  |  |  | 300,000 | 200,000 |  |  |  |  |  |  |
Senior unsecured notes discounts |  |  |  |  |  |  | 5,177,000 |  | 2,763,000 |  |  |
Proceeds from Issuance of First Mortgage Bond | 0 | 256,104,000 | 149,800,000 |  |  |  |  |  |  |  |  |
Debt obligations (Additional) (Textuals) |  |  |  |  |  |  |  |  |  |  |  |
Repurchased outstanding unsecured notes | 106,215,000 |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  | 59,800,000 | 1,888,111,000 |  | 1,722,326,000 | 0 |  | 59,835,000
Less: unamortized exchangeable debt discount |  | 900,000 |  |  |  |  | 0 |  | 906,000 |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 5.50% | 5.50% |  |  |  |  |  |  |  | 5.50% | [1] |
Contractual coupon interest recognized on exchangeable debt | 1,900,000 | 3,200,000 |  |  |  |  |  |  |  |  |  |
Interest on amortization of debt discount | 900,000 | 1,600,000 |  |  |  |  |  |  |  |  |  |
Debt discount write-offs resulting from debt repurchases |  | 2,000,000 |  |  |  |  |  |  |  |  |  |
Debt Instrument, Unamortized Premium |  |  |  | $ 300,000 | $ 200,000 |  |  |  |  |  |  |
[1] | On October 20, 2011, holders representing $59.5 million of the outstanding Exchangeable Notes exercised their right to cause the Company to redeem their notes at par plus accrued and unpaid interest leaving an outstanding balance of $0.4 million. On December 8, 2011, the Company redeemed the remaining balance of the Exchangeable Notes pursuant to its right under the indenture agreement (see related discussion below).

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- Definition Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number APB14-1 -Paragraph 31 -Subparagraph b -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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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- Definition The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number APB14-1 -Paragraph 31 -Subparagraph b -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 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 4: 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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