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Borrowing Arrangements (Details 3) (USD $)
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12 Months Ended | 1 Months Ended | 3 Months Ended | 12 Months Ended | 12 Months Ended | 1 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 12 Months Ended | 1 Months Ended | 3 Months Ended | 12 Months Ended | 1 Months Ended | 3 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 3 Months Ended | 12 Months Ended | 12 Months Ended | 1 Months Ended | |||||||||||||||||||||||
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2009
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Dec. 31, 2011
NHP
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Feb. 29, 2012
6 1/2% Senior Notes due 2016
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Jul. 31, 2011
6 1/2% Senior Notes due 2016
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Sep. 30, 2011
6 1/2% Senior Notes due 2016
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Dec. 31, 2011
6 1/2% Senior Notes due 2016
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Dec. 31, 2009
6 1/2% Senior Notes due 2016
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Dec. 31, 2010
6 1/2% Senior Notes due 2016
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Dec. 31, 2011
Senior notes due, 2014
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May 31, 2011
4.750% Senior Notes due 2021
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Dec. 31, 2011
4.750% Senior Notes due 2021
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Dec. 31, 2010
4.750% Senior Notes due 2021
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Jul. 31, 2011
6.50% senior notes due 2011
NHP
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Dec. 31, 2009
Senior Notes
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Dec. 31, 2011
Senior Notes
NHP
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May 31, 2010
6 3/4% Senior Notes due 2017
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Dec. 31, 2009
6 3/4% Senior Notes due 2017
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Dec. 31, 2011
6 3/4% Senior Notes due 2017
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Dec. 31, 2010
6 3/4% Senior Notes due 2017
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Dec. 31, 2009
9% Senior Notes due 2012
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Dec. 31, 2011
9% Senior Notes due 2012
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Dec. 31, 2010
9% Senior Notes due 2012
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Jun. 30, 2010
7 1/8% Senior Notes due 2015
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Jun. 30, 2010
7 1/8% Senior Notes due 2015
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Dec. 31, 2009
7 1/8% Senior Notes due 2015
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Oct. 31, 2010
6 5/8% Senior Notes due 2014
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Dec. 31, 2010
6 5/8% Senior Notes due 2014
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Dec. 31, 2009
6 5/8% Senior Notes due 2014
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Nov. 30, 2010
3.125% Senior Notes due 2015
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Dec. 31, 2011
3.125% Senior Notes due 2015
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Dec. 31, 2010
3.125% Senior Notes due 2015
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Dec. 31, 2009
Senior notes due, 2009
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Feb. 28, 2011
Mortgage loans
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Mar. 31, 2011
Mortgage loans
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Dec. 31, 2011
Mortgage loans
property
loan
Y
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Dec. 31, 2011
Mortgage loans
Minimum
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Dec. 31, 2011
Mortgage loans
Maximum
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Dec. 31, 2011
Mortgage loans
ASLG
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Dec. 31, 2011
Mortgage loans
NHP
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Feb. 29, 2012
4.25% senior notes due 2022
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Dec. 31, 2011
Unsecured term loan
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Dec. 31, 2011
Unsecured term loan due 2015
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Dec. 31, 2010
Unsecured term loan due 2015
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Dec. 31, 2011
Unsecured term loan due 2017
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Dec. 31, 2010
Unsecured term loan due 2017
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| Debt instruments | |||||||||||||||||||||||||||||||||||||||||||||||
| Principal amount outstanding | $ 6,180,443,000 | $ 2,926,954,000 | $ 652,600,000 | $ 200,000,000 | $ 200,000,000 | $ 400,000,000 | $ 700,000,000 | $ 0 | $ 225,000,000 | $ 225,000,000 | $ 82,433,000 | $ 82,433,000 | $ 400,000,000 | $ 400,000,000 | $ 14,600,000 | $ 500,000,000 | $ 126,875,000 | $ 0 | $ 375,000,000 | $ 0 | |||||||||||||||||||||||||||
| Accounts payable and other liabilities | 1,085,597,000 | 207,143,000 | 14,600,000 | ||||||||||||||||||||||||||||||||||||||||||||
| Principal amount of debt issued | 200,000,000 | 200,000,000 | 50,000,000 | 700,000,000 | 400,000,000 | 600,000,000 | 500,000,000 | ||||||||||||||||||||||||||||||||||||||||
| Interest rate (as a percent) | 6.50% | 6.50% | 6.50% | 4.75% | 4.75% | 4.75% | 6.50% | 6.75% | 6.75% | 6.75% | 6.75% | 9.00% | 9.00% | 9.00% | 7.125% | 7.125% | 7.125% | 6.625% | 6.625% | 3.125% | 3.125% | 3.125% | 4.25% | ||||||||||||||||||||||||
| Discount rate (as a percent) | 0.50% | 15.75% | 1.00% | ||||||||||||||||||||||||||||||||||||||||||||
| Public Offering Price as a Percent of Par | 99.132% | 99.214% | |||||||||||||||||||||||||||||||||||||||||||||
| Proceeds from issuance of debt | 168,500,000 | 693,900,000 | 398,100,000 | 595,300,000 | |||||||||||||||||||||||||||||||||||||||||||
| Principal amount of debt redeemed | 200,000,000 | 200,000,000 | 339,000,000 | 361,600,000 | 1,400,000 | 121,600,000 | 109,400,000 | 142,700,000 | 27,300,000 | 71,700,000 | 103,300,000 | 49,800,000 | |||||||||||||||||||||||||||||||||||
| Repayment of senior notes | 206,500,000 | 147,800,000 | 73,300,000 | ||||||||||||||||||||||||||||||||||||||||||||
| Senior Note Redemption Price as a Percent of Par | 103.25% | ||||||||||||||||||||||||||||||||||||||||||||||
| Repayments of senior debt | 206,500,000 | ||||||||||||||||||||||||||||||||||||||||||||||
| Net loss on extinguishment of debt | 27,604,000 | 9,791,000 | 6,080,000 | 8,700,000 | 8,700,000 | 6,100,000 | 6,400,000 | 2,500,000 | 16,500,000 | ||||||||||||||||||||||||||||||||||||||
| Debt assumed in connection with acquisition | 3,651,089,000 | 125,320,000 | 0 | 1,600,000,000 | 1,200,000,000 | 442,000,000 | |||||||||||||||||||||||||||||||||||||||||
| Senior notes interest rate, Minimum (as a percent) | 6.00% | ||||||||||||||||||||||||||||||||||||||||||||||
| Senior notes interest rate, Maximum (as a percent) | 8.25% | ||||||||||||||||||||||||||||||||||||||||||||||
| Redemption price as a percentage of par | 103.56% | 102.21% | 99.528% | ||||||||||||||||||||||||||||||||||||||||||||
| Percentage of principal amount at which issuers must offer to repay senior notes due to certain kinds of changes of control | 101.00% | ||||||||||||||||||||||||||||||||||||||||||||||
| Number of mortgage loans outstanding | 273 | ||||||||||||||||||||||||||||||||||||||||||||||
| Number of properties which are held as collateral for the mortgage loans | 228 | ||||||||||||||||||||||||||||||||||||||||||||||
| Number of mortgage loans bearing interest at fixed rates | 244 | ||||||||||||||||||||||||||||||||||||||||||||||
| Principal amount outstanding of variable rate mortgage loans | 2,400,000,000 | ||||||||||||||||||||||||||||||||||||||||||||||
| Fixed interest rate (as a percent) | 4.40% | 8.60% | |||||||||||||||||||||||||||||||||||||||||||||
| Number of mortgage loans bearing interest at lender's variable rates | 29 | ||||||||||||||||||||||||||||||||||||||||||||||
| Principal amount outstanding of variable rate mortgage loans | 414,600,000 | ||||||||||||||||||||||||||||||||||||||||||||||
| Interest rate on mortgage loans bearing interest at lender's variable rates (as a percent) | 0.60% | 7.30% | |||||||||||||||||||||||||||||||||||||||||||||
| Weighted average annual rate on fixed rate mortgage loans (as a percent) | 6.10% | ||||||||||||||||||||||||||||||||||||||||||||||
| Weighted average annual rate on variable rate mortgage loans (as a percent) | 2.00% | ||||||||||||||||||||||||||||||||||||||||||||||
| Weighted average maturity period of mortgage loans (in years) | 5.8 | ||||||||||||||||||||||||||||||||||||||||||||||
| Mortgage loans repaid in full | $ 307,200,000 | ||||||||||||||||||||||||||||||||||||||||||||||