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Debt (Details) (USD $) | 3 Months Ended | 6 Months Ended |  | 0 Months Ended |  |  | 6 Months Ended |  | 6 Months Ended |  | 6 Months Ended |  | 6 Months Ended |  | 1 Months Ended | 6 Months Ended |  |  |  | 3 Months Ended | 6 Months Ended |
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Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011 | Dec. 31, 2011 | Jul. 02, 2012 Mortgage and Other Secured Loans: | Jun. 30, 2012 Mortgage and Other Secured Loans: | Dec. 31, 2011 Mortgage and Other Secured Loans: | Jun. 30, 2012 Fixed rate mortgage loans | Dec. 31, 2011 Fixed rate mortgage loans | Jun. 30, 2012 Variable rate secured loans | Dec. 31, 2011 Variable rate secured loans | Jun. 30, 2012 Other construction loan facilities | Dec. 31, 2011 Other construction loan facilities | Jun. 30, 2012 Revolving Credit Facility | Dec. 31, 2011 Revolving Credit Facility | Feb. 29, 2012 Term Loan Facility | Jun. 30, 2012 Term Loan Facility | Dec. 31, 2011 Term Loan Facility | Jun. 30, 2012 Term Loan Facility LIBOR 30-day | Jun. 30, 2012 Unsecured notes payable | Dec. 31, 2011 Unsecured notes payable | Jun. 30, 2012 4.25% Exchangeable Senior Notes | Jun. 30, 2011 4.25% Exchangeable Senior Notes | Jun. 30, 2012 4.25% Exchangeable Senior Notes | Jun. 30, 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 | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying Value | 2,191,851,000 |  | 2,191,851,000 |  | 2,426,303,000 |  | 1,112,664,000 | 1,131,970,000 | 1,009,164,000 | [2] | 1,052,421,000 | [2] | 38,844,000 |  | 39,213,000 | 64,656,000 |  | 40,336,000 | 195,000,000 |  | 662,000,000 |  | 650,000,000 | [1] | 400,000,000 | [1] |  | 5,106,000 |  | 5,050,000 | 229,081,000 | [3] |  | 229,081,000 | [3] |  | 227,283,000 | [3]
Stated interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.00% | [4] |  | 4.25% | [3] |  | 4.25% | [3] |  |  |
Stated Interest Rates, low end of range (as a percent) |  |  |  |  |  |  |  |  | 5.20% | [2],[5] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated Interest Rates, high end of range (as a percent) |  |  |  |  |  |  |  |  | 7.87% | [2],[5] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of variable rate basis |  |  |  |  |  |  |  |  |  |  |  |  | LIBOR | [6] |  | LIBOR | [7] |  | LIBOR | [8] |  |  | LIBOR | [1],[9] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable rate, spread (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  | 2.25% | [6] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable rate, spread low end of range (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.95% | [7] |  | 1.75% | [8] |  |  | 1.65% | [1],[9] |  |  | 1.65% |  |  |  |  |  |  |  |  |  |  |
Variable rate, spread high end of range (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.75% | [7] |  | 2.50% | [8] |  |  | 2.40% | [1],[9] |  |  | 2.40% |  |  |  |  |  |  |  |  |  |  |
Unamortized premium included in carrying value |  |  |  |  |  |  |  |  | 2,000,000 |  | 2,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average interest rate (as a percent) |  |  |  |  |  |  |  |  | 6.01% |  |  |  |  |  |  | 2.72% |  |  | 2.24% |  |  |  | 2.14% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on debt (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  | 2.49% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized discount included in carrying value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,700,000 |  | 1,800,000 | 10,900,000 |  |  | 10,900,000 |  |  | 12,700,000 |
Exchange rate per $1000 principal amount (in common shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20.8513 |  |  |  |
Convertible debt principal amount, basis for exchange |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000 |  |  | 1,000 |  |  |  |
Exchange price per common share based on exchange rate (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 47.96 |  |  | $ 47.96 |  |  |  |
Principal amount of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 240,000,000 |  |  | 240,000,000 |  |  |  |
Effective interest rate, including amortization of issuance costs (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.05% |  |  | 6.05% |  |  |  |
Interest expense at stated interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,550,000 |  | 2,550,000 | 5,100,000 |  | 5,100,000 |  |
Interest expense associated with amortization of discount |  |  | 1,565,000 | 3,367,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 906,000 |  | 852,000 | 1,798,000 |  | 1,692,000 |  |
Total interest expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,456,000 |  | 3,402,000 | 6,898,000 |  | 6,792,000 |  |
Initial amount borrowed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 250,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nonrecourse mortgage loan secured by a property in default |  |  |  |  |  |  | 15,000,000 | 15,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated fair value of property securing nonrecourse mortgage loan in default |  |  |  |  |  |  | 11,000,000 | 11,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on early extinguishment of debt | (169,000) | (25,000) | (169,000) | (25,000) |  | 4,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capitalized interest costs | $ 3,600,000 | $ 4,300,000 | $ 7,400,000 | $ 8,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | As described further below, we entered into a new facility effective on February 14, 2012.
[2] | Several of the fixed rate mortgages carry interest rates that were above or below market rates upon assumption and therefore were recorded at their fair value based on applicable effective interest rates. The carrying values of these loans reflect net unamortized premiums totaling $2.0 million at June 30, 2012 and $2.4 million at December 31, 2011.
[3] | As described further in our 2011 Annual Report on Form 10-K, these notes have an exchange settlement feature that provides that the notes may, under certain circumstances, be exchangeable for cash and, at the Operating Partnership’s discretion, our common shares at an exchange rate (subject to adjustment) of 20.8513 shares per one thousand dollar principal amount of the notes (exchange rate is as of June 30, 2012 and is equivalent to an exchange price of $47.96 per common share). The carrying value of these notes included a principal amount of $240 million and an unamortized discount totaling $10.9 million at June 30, 2012 and $12.7 million at December 31, 2011. The effective interest rate under the notes, including amortization of the issuance costs, was 6.05%. Because the closing price of our common shares at June 30, 2012 and December 31, 2011 was less than the exchange price per common share applicable to these notes, the if-converted value of the notes did not exceed the principal amount. The table below sets forth interest expense recognized on these notes before deductions for amounts capitalized (in thousands): For the Three Months Ended June 30, For the Six Months Ended June 30, 2012 2011 2012 2011Interest expense at stated interest rate$2,550 $2,550 $5,100 $5,100Interest expense associated with amortization of discount906 852 1,798 1,692Total$3,456 $3,402 $6,898 $6,792
[4] | These notes may carry interest rates that were below market rates upon assumption and therefore were recorded at their fair value based on applicable effective interest rates. The carrying value of these notes reflects an unamortized discount totaling $1.7 million at June 30, 2012 and $1.8 million at December 31, 2011.
[5] | The weighted average interest rate on these loans was 6.01% at June 30, 2012.
[6] | The interest rate on the loan outstanding was 2.49% at June 30, 2012.
[7] | The weighted average interest rate on these loans was 2.72% at June 30, 2012.
[8] | The weighted average interest rate on the Revolving Credit Facility was 2.24% at June 30, 2012.
[9] | The weighted average interest rate on these loans was 2.14% at June 30, 2012.

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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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