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Debt - Schedule of Debt (Details) - USD ($)		3 Months Ended
	Dec. 18, 2020	Mar. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Total principal		$ 2,550,175,000	$ 2,550,175,000	$ 2,152,593,000
Unamortized Deferred Financing Costs and Discounts, net		(11,628,000)	(11,628,000)	(12,166,000)
Total Debt, net		2,538,547,000	2,538,547,000	2,140,427,000
Interest Rate Swap
Debt Instrument [Line Items]
Derivative notional amount		$ 750,000,000.0	$ 750,000,000.0
LIBOR
Debt Instrument [Line Items]
Effective interest rate (percent)		0.12%	0.12%
Mortgages
Debt Instrument [Line Items]
Total principal		$ 1,026,675,000	$ 1,026,675,000	1,029,093,000
Fixed and variable rate debt
Debt Instrument [Line Items]
Weighted average interest rate		3.30%	3.30%
Fixed rate debt
Debt Instrument [Line Items]
Weighted average interest rate		3.96%	3.96%
HealthSpring Mortgage Loan | Mortgages
Debt Instrument [Line Items]
Total principal		$ 20,073,000	$ 20,073,000	20,208,000
Contractual stated interest rate (percent)		4.18%	4.18%
Effective interest rate (percent)		4.62%	4.62%
Midland Mortgage Loan | Mortgages
Debt Instrument [Line Items]
Total principal		$ 97,619,000	$ 97,619,000	98,155,000
Contractual stated interest rate (percent)		3.94%	3.94%
Effective interest rate (percent)		4.13%	4.13%
Emporia Partners Mortgage Loan | Mortgages
Debt Instrument [Line Items]
Total principal		$ 1,502,000	$ 1,502,000	1,627,000
Contractual stated interest rate (percent)		5.88%	5.88%
Effective interest rate (percent)		5.97%	5.97%
Samsonite Loan | Mortgages
Debt Instrument [Line Items]
Total principal		$ 19,908,000	$ 19,908,000	20,165,000
Contractual stated interest rate (percent)		6.08%	6.08%
Effective interest rate (percent)		5.09%	5.09%
Highway 94 Loan | Mortgages
Debt Instrument [Line Items]
Total principal		$ 14,453,000	$ 14,453,000	14,689,000
Contractual stated interest rate (percent)		3.75%	3.75%
Effective interest rate (percent)		4.80%	4.80%
Pepsi Bottling Ventures Loan | Mortgages
Debt Instrument [Line Items]
Total principal		$ 18,496,000	$ 18,496,000	18,587,000
Contractual stated interest rate (percent)		3.69%	3.69%
Effective interest rate (percent)		3.92%	3.92%
AIG Loan II | Mortgages
Debt Instrument [Line Items]
Total principal		$ 126,241,000	$ 126,241,000	126,792,000
Contractual stated interest rate (percent)		4.15%	4.15%
Effective interest rate (percent)		4.92%	4.92%
BOA Loan | Mortgages
Debt Instrument [Line Items]
Total principal		$ 375,000,000	$ 375,000,000	375,000,000
Contractual stated interest rate (percent)		3.77%	3.77%
Effective interest rate (percent)		3.91%	3.91%
BOA/KeyBank Loan | Mortgages
Debt Instrument [Line Items]
Total principal		$ 250,000,000	$ 250,000,000	250,000,000
Contractual stated interest rate (percent)		4.32%	4.32%
Effective interest rate (percent)		4.14%	4.14%
AIG Loan | Mortgages
Debt Instrument [Line Items]
Total principal		$ 103,383,000	$ 103,383,000	103,870,000
Contractual stated interest rate (percent)		4.96%	4.96%
Effective interest rate (percent)		5.08%	5.08%
Revolving Credit Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Total principal		$ 373,500,000	$ 373,500,000	373,500,000
Effective interest rate (percent)		1.84%	1.84%
Initial debt instrument term			1 year
Debt instrument extended term			1 year
Revolving Credit Facility | Revolving Credit Facility | LIBOR
Debt Instrument [Line Items]
Spread on LIBOR (percent)			1.60%
2023 Term Loan | Term Loans
Debt Instrument [Line Items]
Total principal		$ 200,000,000	$ 200,000,000	200,000,000
Effective interest rate (percent)		1.76%	1.76%
Initial debt instrument term	5 years	5 years
2023 Term Loan | Term Loans | LIBOR
Debt Instrument [Line Items]
Spread on LIBOR (percent)			1.55%
2024 Term Loan | Term Loans
Debt Instrument [Line Items]
Total principal		$ 400,000,000	$ 400,000,000	400,000,000
Effective interest rate (percent)		1.75%	1.75%
Initial debt instrument term	5 years	5 years
2024 Term Loan | Term Loans | LIBOR
Debt Instrument [Line Items]
Spread on LIBOR (percent)			1.55%
2025 Term Loan | Term Loans
Debt Instrument [Line Items]
Total principal		$ 400,000,000	$ 400,000,000	0
Effective interest rate (percent)		1.97%	1.97%
Initial debt instrument term	5 years	5 years
2025 Term Loan | Term Loans | LIBOR
Debt Instrument [Line Items]
Spread on LIBOR (percent)			1.55%
2026 Term Loan | Term Loans
Debt Instrument [Line Items]
Total principal		$ 150,000,000	$ 150,000,000	$ 150,000,000
Effective interest rate (percent)		2.02%	2.02%
Initial debt instrument term		7 years
2026 Term Loan | Term Loans | LIBOR
Debt Instrument [Line Items]
Spread on LIBOR (percent)			1.85%

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average interest rate of debt outstanding.

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