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Debt - Schedule of Debt Maturities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Jul. 31, 2019
May 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]        
Long-term debt, gross $ 6,307,244      
(Discounts), premiums and debt costs, net (40,402)      
Long-term debt, excluding disposal group 6,266,842      
Long-term debt 6,299,131      
Other debt 84,771     $ 90,785
Debt maturing in 2020        
Debt Instrument [Line Items]        
2020 97,132      
Debt maturing in 2021        
Debt Instrument [Line Items]        
2021 11,821      
Debt maturing in 2022        
Debt Instrument [Line Items]        
2022 303,886      
Debt maturing in 2023        
Debt Instrument [Line Items]        
2023 554,069      
Debt maturing in 2024        
Debt Instrument [Line Items]        
2024 1,404,247      
Thereafter        
Debt Instrument [Line Items]        
Thereafter 3,936,089      
Bank Line of Credit        
Debt Instrument [Line Items]        
Long-term debt, gross 0      
(Discounts), premiums and debt costs, net 0      
Long-term debt, excluding disposal group 0      
Bank Line of Credit | Debt maturing in 2020        
Debt Instrument [Line Items]        
2020 0      
Bank Line of Credit | Debt maturing in 2021        
Debt Instrument [Line Items]        
2021 0      
Bank Line of Credit | Debt maturing in 2022        
Debt Instrument [Line Items]        
2022 0      
Bank Line of Credit | Debt maturing in 2023        
Debt Instrument [Line Items]        
2023 0      
Bank Line of Credit | Debt maturing in 2024        
Debt Instrument [Line Items]        
2024 0      
Bank Line of Credit | Thereafter        
Debt Instrument [Line Items]        
Thereafter 0      
Commercial Paper        
Debt Instrument [Line Items]        
Long-term debt, gross 93,000      
(Discounts), premiums and debt costs, net 0      
Long-term debt, excluding disposal group 93,000      
Commercial Paper | Debt maturing in 2020        
Debt Instrument [Line Items]        
2020 93,000      
Commercial Paper | Debt maturing in 2021        
Debt Instrument [Line Items]        
2021 0      
Commercial Paper | Debt maturing in 2022        
Debt Instrument [Line Items]        
2022 0      
Commercial Paper | Debt maturing in 2023        
Debt Instrument [Line Items]        
2023 0      
Commercial Paper | Debt maturing in 2024        
Debt Instrument [Line Items]        
2024 0      
Commercial Paper | Thereafter        
Debt Instrument [Line Items]        
Thereafter 0      
Term Loan        
Debt Instrument [Line Items]        
Long-term debt, gross 250,000      
(Discounts), premiums and debt costs, net (1,058)      
Long-term debt, excluding disposal group 248,942      
Term Loan | Debt maturing in 2020        
Debt Instrument [Line Items]        
2020 0      
Term Loan | Debt maturing in 2021        
Debt Instrument [Line Items]        
2021 0      
Term Loan | Debt maturing in 2022        
Debt Instrument [Line Items]        
2022 0      
Term Loan | Debt maturing in 2023        
Debt Instrument [Line Items]        
2023 0      
Term Loan | Debt maturing in 2024        
Debt Instrument [Line Items]        
2024 250,000      
Term Loan | Thereafter        
Debt Instrument [Line Items]        
Thereafter 0      
Unsecured Debt        
Debt Instrument [Line Items]        
Long-term debt, gross 5,700,000      
(Discounts), premiums and debt costs, net (52,007)      
Long-term debt, excluding disposal group $ 5,647,993      
Weighted-average interest rate (as a percent) 3.94%      
Weighted-average maturity 7 years      
Unsecured Debt | Minimum        
Debt Instrument [Line Items]        
Interest rate (as a percent) 3.14%      
Unsecured Debt | Maximum        
Debt Instrument [Line Items]        
Interest rate (as a percent) 6.87%      
Unsecured Debt | Debt maturing in 2020        
Debt Instrument [Line Items]        
Interest rate (as a percent) 0.00%      
2020 $ 0      
Unsecured Debt | Debt maturing in 2021        
Debt Instrument [Line Items]        
Interest rate (as a percent) 0.00%      
2021 $ 0      
Unsecured Debt | Debt maturing in 2022        
Debt Instrument [Line Items]        
Interest rate (as a percent) 3.37%      
2022 $ 300,000      
Unsecured Debt | Debt maturing in 2023        
Debt Instrument [Line Items]        
Interest rate (as a percent) 4.37%      
2023 $ 550,000      
Unsecured Debt | Debt maturing in 2024        
Debt Instrument [Line Items]        
Interest rate (as a percent) 4.17%      
2024 $ 1,150,000      
Unsecured Debt | Thereafter        
Debt Instrument [Line Items]        
Interest rate (as a percent) 3.86%      
Thereafter $ 3,700,000      
Mortgage debt        
Debt Instrument [Line Items]        
Long-term debt, gross 264,244      
(Discounts), premiums and debt costs, net 12,663      
Long-term debt, excluding disposal group $ 276,907      
Weighted-average interest rate (as a percent) 4.09%      
Weighted-average maturity 13 years      
Mortgage debt | Minimum        
Debt Instrument [Line Items]        
Interest rate (as a percent) 2.22%      
Mortgage debt | Maximum        
Debt Instrument [Line Items]        
Interest rate (as a percent) 5.91%      
Mortgage debt | Debt maturing in 2020        
Debt Instrument [Line Items]        
Interest rate (as a percent) 5.08%      
2020 $ 4,132      
Mortgage debt | Debt maturing in 2021        
Debt Instrument [Line Items]        
Interest rate (as a percent) 5.26%      
2021 $ 11,821      
Mortgage debt | Debt maturing in 2022        
Debt Instrument [Line Items]        
Interest rate (as a percent) 0.00%      
2022 $ 3,886      
Mortgage debt | Debt maturing in 2023        
Debt Instrument [Line Items]        
Interest rate (as a percent) 0.00%      
2023 $ 4,069      
Mortgage debt | Debt maturing in 2024        
Debt Instrument [Line Items]        
Interest rate (as a percent) 0.00%      
2024 $ 4,247      
Mortgage debt | Thereafter        
Debt Instrument [Line Items]        
Interest rate (as a percent) 4.09%      
Thereafter $ 236,089      
Life Care Bonds and Demand Notes        
Debt Instrument [Line Items]        
Other debt 85,000      
Life Care Bonds        
Debt Instrument [Line Items]        
Other debt $ 52,000      
On-Demand Note        
Debt Instrument [Line Items]        
Interest rate (as a percent) 3.60%      
Other debt $ 33,000      
Bank Line of Credit        
Debt Instrument [Line Items]        
Long-term debt 0      
Commercial Paper        
Debt Instrument [Line Items]        
Long-term debt 93,000      
Term Loan        
Debt Instrument [Line Items]        
Long-term debt 248,942      
Unsecured Debt        
Debt Instrument [Line Items]        
Long-term debt 5,647,993      
Mortgage debt        
Debt Instrument [Line Items]        
Long-term debt, gross   $ 112,000 $ 50,000  
Long-term debt 309,196      
Weighted-average interest rate (as a percent)   4.89% 4.83%  
Disposal Group, Held-for-sale, Not Discontinued Operations        
Debt Instrument [Line Items]        
Debt on assets held for sale 32,289      
Disposal Group, Held-for-sale, Not Discontinued Operations | Bank Line of Credit        
Debt Instrument [Line Items]        
Debt on assets held for sale 0      
Disposal Group, Held-for-sale, Not Discontinued Operations | Commercial Paper        
Debt Instrument [Line Items]        
Debt on assets held for sale 0      
Disposal Group, Held-for-sale, Not Discontinued Operations | Term Loan        
Debt Instrument [Line Items]        
Debt on assets held for sale 0      
Disposal Group, Held-for-sale, Not Discontinued Operations | Unsecured Debt        
Debt Instrument [Line Items]        
Debt on assets held for sale 0      
Disposal Group, Held-for-sale, Not Discontinued Operations | Mortgage debt        
Debt Instrument [Line Items]        
Debt on assets held for sale $ 32,289      
Held-for-sale | Bank Line of Credit | Minimum        
Debt Instrument [Line Items]        
Weighted-average interest rate (as a percent) 3.45%      
Held-for-sale | Bank Line of Credit | Maximum        
Debt Instrument [Line Items]        
Weighted-average interest rate (as a percent) 6.80%