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Debt (Details) (USD $) | 12 Months Ended |  |  | 12 Months Ended |  | 12 Months Ended |  |  |  | 12 Months Ended |  | 1 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended |  | 1 Months Ended | 12 Months Ended |  |  | 1 Months Ended | 12 Months Ended |  |  | 12 Months Ended | 0 Months Ended |  | 0 Months Ended |  |  | 12 Months Ended |  | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Mortgage and Other Secured Loans: | Dec. 31, 2012 Mortgage and Other Secured Loans: | Dec. 31, 2013 Fixed rate mortgage loans | Dec. 31, 2012 Fixed rate mortgage loans | Dec. 31, 2013 Variable rate secured loans | Dec. 31, 2012 Variable rate secured loans | Dec. 31, 2013 Other construction loan facilities | Dec. 31, 2012 Other construction loan facilities | Dec. 31, 2013 Revolving Credit Facility | Dec. 31, 2012 Revolving Credit Facility | Sep. 30, 2011 Term Credit Facility Effective September 2011 | Dec. 31, 2013 Term Credit Facility Effective September 2011 | Feb. 14, 2012 Term Credit Facility Effective February 2012 | Dec. 31, 2013 Term Credit Facility Effective February 2012 | Aug. 03, 2012 Term Credit Facility Effective August 2012 | Dec. 31, 2013 Term Loan Facilities | Dec. 31, 2012 Term Loan Facilities | Apr. 30, 2010 4.25% Exchangeable Senior Notes | Dec. 31, 2013 4.25% Exchangeable Senior Notes | Dec. 31, 2012 4.25% Exchangeable Senior Notes | Dec. 31, 2011 4.25% Exchangeable Senior Notes | Dec. 31, 2013 Unsecured notes payable | Dec. 31, 2012 Unsecured notes payable | Sep. 30, 2011 3.5% Exchangeable Senior Notes | Dec. 31, 2011 3.5% Exchangeable Senior Notes | Sep. 15, 2011 3.5% Exchangeable Senior Notes | Dec. 31, 2013 Construction loans Fixed rate mortgage loans | Dec. 31, 2013 Senior Notes | May 06, 2013 Senior Notes 3.60% Senior Notes | Dec. 31, 2013 Senior Notes 3.60% Senior Notes | Sep. 15, 2013 Senior Notes 5.250% Senior Notes | Dec. 31, 2013 Senior Notes 5.250% Senior Notes | Sep. 16, 2013 Senior Notes 5.250% Senior Notes | Dec. 31, 2013 London Interbank Offered Rate (LIBOR) Term Credit Facility Effective September 2011 | Dec. 31, 2013 London Interbank Offered Rate (LIBOR) Term Credit Facility Effective February 2012 | Dec. 31, 2013 London Interbank Offered Rate (LIBOR) Term Credit Facility Effective August 2012 | Dec. 31, 2013 Adjusted Treasury [Member] Senior Notes 3.60% Senior Notes | Dec. 31, 2013 Adjusted Treasury [Member] Senior Notes 5.250% Senior Notes | Dec. 31, 2013 Revolving Credit Facility | Dec. 31, 2012 Revolving Credit Facility | Dec. 31, 2013 Minimum Revolving Credit Facility | Dec. 31, 2013 Minimum Term Loan Facilities | Dec. 31, 2013 Minimum London Interbank Offered Rate (LIBOR) Term Credit Facility Effective September 2011 | Dec. 31, 2013 Minimum London Interbank Offered Rate (LIBOR) Term Credit Facility Effective February 2012 | Dec. 31, 2013 Minimum London Interbank Offered Rate (LIBOR) Term Credit Facility Effective August 2012 | Dec. 31, 2013 Minimum Revolving Credit Facility | Dec. 31, 2013 Minimum Revolving Credit Facility London Interbank Offered Rate (LIBOR) | Dec. 31, 2013 Maximum Revolving Credit Facility | Dec. 31, 2013 Maximum Term Loan Facilities | Dec. 31, 2013 Maximum London Interbank Offered Rate (LIBOR) Term Credit Facility Effective September 2011 | Dec. 31, 2013 Maximum London Interbank Offered Rate (LIBOR) Term Credit Facility Effective February 2012 | Dec. 31, 2013 Maximum London Interbank Offered Rate (LIBOR) Term Credit Facility Effective August 2012 | Dec. 31, 2013 Maximum Revolving Credit Facility | Dec. 31, 2013 Maximum Revolving Credit Facility London Interbank Offered Rate (LIBOR)
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Availability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 800,000,000 | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, net | 1,927,703,000 |  | 2,019,168,000 |  | 712,751,000 | 1,016,446,000 | 675,060,000 | [2],[3] | 948,414,000 | [2],[3] | 37,691,000 |  | 38,475,000 | 0 | 29,557,000 | 0 | [1] | 0 | [1] |  |  |  |  |  | 620,000,000 | [1],[4] | 770,000,000 | [1],[4] |  | 563,000 | [1] | 230,934,000 | [1] |  | 1,700,000 |  | 1,788,000 |  |  |  | 13,900,000 |  |  | 347,244,000 |  | 245,445,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 26,200,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.25% |  |  |  |  | 0.00% | [5] |  |  |  | 3.50% |  |  | 3.60% | 3.60% |  | 5.25% | 5.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated Interest Rates, low end of range (as a percent) |  |  |  |  |  |  | 3.96% | [6] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated Interest Rates, high end of range (as a percent) |  |  |  |  |  |  | 7.87% | [6] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of variable rate basis |  |  |  |  |  |  |  |  |  |  | LIBOR | [7] |  |  |  | LIBOR |  |  |  |  |  |  |  |  | LIBOR | [8] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | LIBOR | LIBOR | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable rate, spread (as a percent) |  |  |  |  |  |  |  |  |  |  | 2.25% | [7] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.975% | 1.10% | [8] | 1.10% | 1.10% | 2.10% |  | 0.975% | 1.75% | 2.60% | [8] | 2.00% | 2.00% | 2.60% |  | 1.75%
Line of Credit Facility, Commitment Fee Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.125% |  |  |  |  |  |  |  | 0.35% |
Unamortized premium included in carrying value |  |  |  |  |  |  | 69,000 |  | 1,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average interest rate (as a percent) |  |  |  |  |  |  | 6.14% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.79% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on debt (as a percent) |  |  |  |  |  |  |  |  |  |  | 2.42% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional borrowing capacity available provided there is no default under the agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000,000 |  |  |  | 80,000,000 | 180,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized discount included in carrying value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,000 |  | 9,100,000 |  |  | 761,000 |  | 873,000 |  |  |  |  |  |  | 2,800,000 |  | 4,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expansion right, maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,300,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount available as a percentage of unencumbered Asset value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 60.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extension option period (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, extension fee percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.15% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 784,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial amount borrowed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 400,000,000 |  | 250,000,000 |  | 120,000,000 |  |  |  |  | 240,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 347,100,000 |  | 245,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term Facility, Amount Remaining After Partial Early Termination |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 250,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extension fee as a percentage of total availability of the facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.15% |  | 0.15% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage over the entity's common stock price at the time of issuance which was used to determine the initial exchange rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of notes, percentage of principal paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of loans repaid upon entry into Revolving Credit Facility and Term Loan Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 239,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on early extinguishment of debt | 27,030,000 |  | 943,000 | 1,639,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt | 1,935,718,000 | [9] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 575,000 |  | 240,000,000 |  |  |  |  |  |  |  | 162,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate, including amortization of issuance costs (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.05% |  |  |  |  |  |  |  |  |  | 5.97% |  |  |  | 3.70% |  | 5.49% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense at stated interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,208,000 |  | 10,200,000 |  | 10,200,000 |  |  |  |  | 4,013,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense associated with amortization of discount | 1,159,000 |  | 3,155,000 | 5,540,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,615,000 |  | 3,651,000 |  | 3,437,000 |  |  |  |  | 2,617,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total interest expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,823,000 |  | 13,851,000 |  | 13,637,000 |  |  |  |  | 6,630,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Decrease, Repayments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 162,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 350,000,000 |  |  |  | 250,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance as a percentage of principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 99.816% |  | 98.783% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis points used in determining redemption price prior to maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30.00% | 40.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption percentage within three months of maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 55,500,000 |  | $ 276,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.74% |  | 2.27% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Refer to the paragraphs below for further disclosure.
[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 $69,000 at December 31, 2013 and $1.3 million at December 31, 2012.
[3] | Includes $13.9 million balance on construction loans with maximum available borrowings of $26.2 million.
[4] | As discussed below, we have the ability to borrow an aggregate of an additional $180.0 million under these term loan facilities, provided that there is no default under the facilities and subject to the approval of the lenders.
[5] | These notes 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 $761,000 at December 31, 2013 and $873,000 at December 31, 2012.
[6] | The weighted average interest rate on these loans was 6.14% at December 31, 2013.
[7] | The interest rate on the loan outstanding was 2.42% at December 31, 2013.
[8] | The weighted average interest rate on these loans was 1.79% at December 31, 2013.
[9] | Represents scheduled principal amortization and maturities only and therefore excludes net discounts of $8.0 million.

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