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Debt (Details) (USD $) | 3 Months Ended |  |  |  | 3 Months Ended |  | 3 Months Ended |  | 3 Months Ended |  | 3 Months Ended |  | 1 Months Ended |  |  | 3 Months Ended |  |  | 3 Months Ended |
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Mar. 31, 2012 | Mar. 31, 2011 | Dec. 31, 2011 | Mar. 31, 2012 Mortgage and Other Secured Loans: | Dec. 31, 2011 Mortgage and Other Secured Loans: | Mar. 31, 2012 Fixed rate mortgage loans | Dec. 31, 2011 Fixed rate mortgage loans | Mar. 31, 2012 Variable rate secured loans | Dec. 31, 2011 Variable rate secured loans | Mar. 31, 2012 Other construction loan facilities | Dec. 31, 2011 Other construction loan facilities | Mar. 31, 2012 Revolving Credit Facility | Dec. 31, 2011 Revolving Credit Facility | Feb. 29, 2012 Term Loan Facility | Mar. 31, 2012 Term Loan Facility | Dec. 31, 2011 Term Loan Facility | Mar. 31, 2012 Term Loan Facility LIBOR 30-day | Mar. 31, 2012 Unsecured notes payable | Dec. 31, 2011 Unsecured notes payable | Mar. 31, 2012 4.25% Exchangeable Senior Notes | Mar. 31, 2011 4.25% Exchangeable Senior Notes | Dec. 31, 2011 4.25% Exchangeable Senior Notes
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Availability |  |  |  |  |  |  |  |  |  | $ 123,802,000 |  | $ 1,000,000,000 |  |  | $ 650,000,000 |  |  |  |  |  |  |
Carrying Value | 2,418,078,000 |  | 2,426,303,000 | 1,138,825,000 | 1,131,970,000 | 1,049,204,000 | 1,052,421,000 | 39,027,000 | 39,213,000 | 50,594,000 | 40,336,000 | 396,000,000 | 662,000,000 |  | 650,000,000 | 400,000,000 |  | 5,078,000 | 5,050,000 | 228,175,000 |  | 227,283,000
Stated interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.00% |  | 4.25% |  |
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 |  |  |  |  |
Variable rate, spread (as a percent) |  |  |  |  |  |  |  | 2.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 premium included in carrying value |  |  |  |  |  | 2,200,000 | 2,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized discount included in carrying value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,700,000 | 1,800,000 | 11,800,000 |  | 12,700,000
Interest rate on debt (as a percent) |  |  |  |  |  |  |  | 2.49% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average interest rate (as a percent) |  |  |  |  |  | 6.01% |  |  |  | 2.73% |  | 2.24% |  |  | 2.15% |  |  |  |  |  |  |
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 |  |
Principal amount of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 240,000,000 |  |
Effective interest rate, including amortization of issuance costs (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.05% |  |
Interest expense at stated interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,550,000 | 2,550,000 |
Interest expense associated with amortization of discount | 775,000 | 1,649,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 892,000 | 840,000 |
Total interest expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,442,000 | 3,390,000 |
Initial amount borrowed |  |  |  |  |  |  |  |  |  |  |  |  |  | 250,000,000 |  |  |  |  |  |  |  |
Estimated fair value of property secured by nonrecourse mortgage loan in default |  |  |  | 11,000,000 | 11,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nonrecourse mortgage loan secured by a property in default |  |  |  | 15,000,000 | 15,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capitalized interest costs | $ 3,800,000 | $ 4,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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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 Increase for additional borrowings on the debt instrument during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 4 -Section 08 -Paragraph f Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 + Details
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- Definition The effective interest rate at the end of 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 22 -Article 5 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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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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- 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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- Definition Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. 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, and after deducting unamortized discount or premiums, if any. + 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 Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 7 -Section 03 -Paragraph 16 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 + Details
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