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Debt (Details) (USD $) | 12 Months Ended |  |  | 12 Months Ended |  |  |  | 1 Months Ended | 12 Months Ended |  | 12 Months Ended |  |  | 4 Months Ended | 12 Months Ended |  | 4 Months Ended | 1 Months Ended | 4 Months Ended |  | 4 Months Ended | 1 Months Ended |  |  | 1 Months Ended | 12 Months Ended |  | 1 Months Ended | 12 Months Ended |
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2011 Mortgage and Other Secured Loans: | Dec. 31, 2010 Mortgage and Other Secured Loans: | Dec. 31, 2011 Fixed rate mortgage loans | Dec. 31, 2010 Fixed rate mortgage loans | Dec. 31, 2011 Revolving Construction Facility | Dec. 31, 2010 Revolving Construction Facility | Sep. 30, 2011 Variable rate secured loans loan | Dec. 31, 2011 Variable rate secured loans | Dec. 31, 2010 Variable rate secured loans | Dec. 31, 2011 Other construction loan facilities | Dec. 31, 2010 Other construction loan facilities | Dec. 31, 2011 Other construction loan facilities LIBOR 30-day | Dec. 31, 2011 Revolving Credit Facility Y | Dec. 31, 2010 Revolving Credit Facility | Sep. 01, 2011 Revolving Credit Facility | Dec. 31, 2011 Revolving Credit Facility Maximum | Dec. 31, 2011 Revolving Credit Facility Minimum | Dec. 31, 2011 Revolving Credit Facility LIBOR 30-day | Sep. 30, 2011 Term Loan Facility | Dec. 31, 2011 Term Loan Facility Y | Dec. 31, 2011 Term Loan Facility Maximum | Dec. 31, 2011 Term Loan Facility Minimum | Dec. 31, 2011 Term Loan Facility LIBOR 30-day | Sep. 30, 2011 Revolving facilities and variable rate secured loans | Dec. 31, 2011 Unsecured notes payable | Dec. 31, 2010 Unsecured notes payable | Apr. 30, 2010 4.25% Exchangeable Senior Notes | Dec. 31, 2011 4.25% Exchangeable Senior Notes | Dec. 31, 2010 4.25% Exchangeable Senior Notes | Apr. 07, 2010 4.25% Exchangeable Senior Notes | Sep. 30, 2011 3.5% Exchangeable Senior Notes | Dec. 31, 2011 3.5% Exchangeable Senior Notes | Dec. 31, 2010 3.5% Exchangeable Senior Notes | Dec. 31, 2009 3.5% Exchangeable Senior Notes | Sep. 15, 2011 3.5% Exchangeable Senior Notes
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Availability |  |  |  |  |  |  |  |  |  |  |  |  | $ 123,802,000 |  |  | $ 1,000,000,000 |  | $ 1,000,000,000 |  |  |  |  | $ 400,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying Value | 2,426,303,000 | 2,323,681,000 |  | 1,131,970,000 | 1,643,005,000 | 1,052,421,000 | 1,173,358,000 |  | 142,339,000 |  | 39,213,000 | 310,555,000 | 40,336,000 | 16,753,000 |  | 662,000,000 | 295,000,000 |  |  |  |  |  | 400,000,000 |  |  |  |  | 5,050,000 | 1,947,000 |  | 227,283,000 | 223,846,000 |  |  |  | 159,883,000 |  |
Stated interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.00% |  |  | 4.25% |  | 4.25% |  |  | 3.50% |  | 3.50%
Stated Interest Rates, low end of range (as a percent) |  |  |  |  |  | 5.20% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated Interest Rates, high end of range (as a percent) |  |  |  |  |  | 7.87% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of variable rate basis |  |  |  |  |  |  |  |  |  |  | LIBOR |  | LIBOR |  |  | LIBOR |  |  |  |  | LIBOR |  | LIBOR |  |  | LIBOR |  |  |  |  |  |  |  |  |  |  |  |
Variable rate, spread (as a percent) |  |  |  |  |  |  |  |  |  |  | 2.25% |  | 2.75% |  |  |  |  |  | 2.50% | 1.75% |  |  |  | 2.40% | 1.65% |  |  |  |  |  |  |  |  |  |  |  |  |
Variable rate, spread low end of range (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.95% |  |  |  |  |  | 1.75% |  |  |  |  | 1.65% |  |  |  |  |  |  |  |  |  |  |  |
Variable rate, spread high end of range (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.75% |  |  |  |  |  | 2.50% |  |  |  |  | 2.40% |  |  |  |  |  |  |  |  |  |  |  |
Unamortized discount included in carrying value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,800,000 | 1,100,000 |  | 12,700,000 | 16,200,000 |  |  |  | 2,600,000 |  |
Unamortized premium included in carrying value |  |  |  |  |  | 2,400,000 | 3,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extension option period (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on debt (as a percent) |  |  |  |  |  |  |  |  |  |  | 2.52% |  |  |  |  |  |  |  |  |  |  |  | 2.18% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expansion right, maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount available as a percentage of unencumbered Asset value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 60.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extension fee as a percentage of total availability of the facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.20% |  |  |  |  |  |  | 0.20% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of quarterly fee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.35% | 0.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 329,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of loans repaid upon entry into Revolving Credit Facility and Term Loan Agreement |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial amount borrowed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 400,000,000 |  |  |  |  |  |  |  | 240,000,000 |  |  |  |  |  |  |  |
Additional borrowing capacity available provided there is no default under the agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of loans repaid upon entry into Revolving Credit Facility and Term Loan Agreement |  |  |  |  |  |  |  |  |  | 270,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on early extinguishment of debt | 1,683,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,700,000 |  |  |  |  |  |  |  |  |  |  |
Amount of loans repaid upon entry into Revolving Credit Facility and Term Loan Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 162,500,000 |  |  |  |
Principal amount of debt | 2,438,471,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 221,400,000 |  |  | 162,500,000 |  |
Exchange rate per $1000 principal amount (in common shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20.8513 |  |  |  |  |  |  |
Convertible debt principal amount, basis for exchange |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000 |  |  |  |  |  |  |
Exchange price per common share based on exchange rate (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 47.96 |  |  |  |  |  |  |
Percentage over the entity's common stock price at the time of issuance which was used to determine the initial exchange rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20.00% |  |  |  |  |  |  |  |
Percentage over the entity's common stock price at the time of issuance which was used to determine the initial exchange rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |
Initial equity component of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 18,600,000 |  |  |  |  |
Finance fees recognized in relation to notes in equity | 44,159,000 | 31,784,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of notes, percentage of principal paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00%
Effective interest rate, including amortization of issuance costs (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.05% |  |  |  |  |  |  | 5.97%
Interest expense at stated interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,200,000 | 7,480,000 |  |  | 4,013,000 | 5,687,000 | 5,687,000 |
Interest expense associated with amortization of discount | 5,540,000 | 5,841,000 | 3,412,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,437,000 | 2,445,000 |  |  | 2,617,000 | 3,736,000 | 3,520,000 |
Nonrecourse mortgage loan secured by a property in default |  |  |  | 15,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated fair value of property secured by nonrecourse mortgage loan in default |  |  |  | 9,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total interest expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,637,000 | 9,925,000 |  |  | 6,630,000 | 9,423,000 | 9,207,000 |
Weighted average borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 482,300,000 | $ 337,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.65% | 1.11% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average interest rate (as a percent) |  |  |  |  |  | 6.01% |  | 2.82% |  |  |  |  |  |  |  | 1.68% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Represents the extension fee as a percentage of total availability of the facility for the extension of facility. + References No definition available. + Details
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- Definition The quarterly fee for the facility, expressed as a percentage of the available but unused credit capacity under the credit facility. + References No definition available. + Details
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- Definition The high end of the range of percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition The low end of the range of percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Represents the percentage over the entity's common stock price at the time of issuance of the debt instrument which was used to determine the initial exchange rate of the debt. + References No definition available. + Details
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- Definition The principal amount of notes for purposes of computing the conversion ratio of convertible debt. + References No definition available. + Details
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- Definition Represents the repurchase price as a percentage of the principal amount at which the debt instrument may be required to be redeemed in the event of a "fundamental change", as defined under the terms of the notes. + References No definition available. + Details
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- Definition Maximum borrowing capacity to which the credit facility may be expanded as per the terms of the agreement, which is the right of the reporting entity. + References No definition available. + Details
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- Definition Percentage of unencumbered asset value used for computation of amounts available under the facility. + References No definition available. + Details
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- Definition Represents the number of loans repaid by the entity during the reporting period upon entry into other loans. + References No definition available. + Details
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- Definition The component of interest expense representing the noncash expenses charged against earnings in the period to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate caption: Noncash Interest Expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16 -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 5 -Section 03 -Paragraph 8 Reference 5: 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 + Details
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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 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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