Debt - Schedule of Debt (Details) - USD ($) $ in Thousands				3 Months Ended	12 Months Ended
	Jul. 14, 2021	Jul. 13, 2021	Dec. 18, 2020	Sep. 30, 2021	Dec. 31, 2021	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Total Debt					$ 2,541,515	$ 2,541,515	$ 2,152,593
Unamortized Deferred Financing Costs and Discounts, net					(9,138)	(9,138)	(12,166)
Total					$ 2,532,377	$ 2,532,377	2,140,427
LIBOR
Debt Instrument [Line Items]
Effective interest rate (percent)					0.10%	0.10%
Revolving Credit Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Total Debt					$ 373,500	$ 373,500	373,500
Effective interest rate (percent)					1.67%	1.67%
Term of debt instrument					6 months
Extended term on debt					1 year
Revolving Credit Facility | LIBOR | Revolving Credit Facility
Debt Instrument [Line Items]
Interest rate spread on the variable rate debt (percent)					1.45%
2023 Term Loan
Debt Instrument [Line Items]
Effective interest rate (percent)					1.59%	1.59%
2023 Term Loan | LIBOR
Debt Instrument [Line Items]
Interest rate spread on the variable rate debt (percent)					1.40%
2024 Term Loan
Debt Instrument [Line Items]
Effective interest rate (percent)					1.58%	1.58%
2024 Term Loan | LIBOR
Debt Instrument [Line Items]
Interest rate spread on the variable rate debt (percent)					1.40%
2026 Term Loan
Debt Instrument [Line Items]
Effective interest rate (percent)					1.55%	1.55%
2026 Term Loan | LIBOR
Debt Instrument [Line Items]
Interest rate spread on the variable rate debt (percent)					1.40%
Mortgages
Debt Instrument [Line Items]
Total Debt					$ 1,018,015	$ 1,018,015	1,029,093
Mortgages | HealthSpring Mortgage Loan
Debt Instrument [Line Items]
Total Debt					$ 19,669	$ 19,669	20,208
Contractual interest rate on fixed rate debt (percent)					4.18%	4.18%
Effective interest rate (percent)					4.63%	4.63%
Mortgages | Midland Mortgage Loan
Debt Instrument [Line Items]
Total Debt					$ 95,792	$ 95,792	98,155
Contractual interest rate on fixed rate debt (percent)					3.94%	3.94%
Effective interest rate (percent)					4.12%	4.12%
Mortgages | Emporia Partners Mortgage Loan
Debt Instrument [Line Items]
Total Debt					$ 0	$ 0	1,627
Contractual interest rate on fixed rate debt (percent)					0.00%	0.00%
Effective interest rate (percent)					0.00%	0.00%
Mortgages | Samsonite Loan
Debt Instrument [Line Items]
Total Debt					$ 19,114	$ 19,114	20,165
Contractual interest rate on fixed rate debt (percent)					6.08%	6.08%
Effective interest rate (percent)					5.03%	5.03%
Mortgages | Highway 94 Loan
Debt Instrument [Line Items]
Total Debt					$ 13,732	$ 13,732	14,689
Contractual interest rate on fixed rate debt (percent)					3.75%	3.75%
Effective interest rate (percent)					4.87%	4.87%
Mortgages | Pepsi Bottling Ventures Loan
Debt Instrument [Line Items]
Total Debt					$ 18,218	$ 18,218	18,587
Contractual interest rate on fixed rate debt (percent)					3.69%	3.69%
Effective interest rate (percent)					3.92%	3.92%
Mortgages | AIG Loan II
Debt Instrument [Line Items]
Total Debt					$ 124,606	$ 124,606	126,792
Contractual interest rate on fixed rate debt (percent)					4.15%	4.15%
Effective interest rate (percent)					4.94%	4.94%
Mortgages | BOA Loan
Debt Instrument [Line Items]
Total Debt					$ 375,000	$ 375,000	375,000
Contractual interest rate on fixed rate debt (percent)					3.77%	3.77%
Effective interest rate (percent)					3.91%	3.91%
Mortgages | BOA/KeyBank Loan
Debt Instrument [Line Items]
Total Debt					$ 250,000	$ 250,000	250,000
Contractual interest rate on fixed rate debt (percent)					4.32%	4.32%
Effective interest rate (percent)					4.14%	4.14%
Mortgages | AIG Loan
Debt Instrument [Line Items]
Total Debt					$ 101,884	$ 101,884	103,870
Contractual interest rate on fixed rate debt (percent)					4.96%	4.96%
Effective interest rate (percent)					5.07%	5.07%
Loans Payable | 2023 Term Loan
Debt Instrument [Line Items]
Total Debt					$ 200,000	$ 200,000	200,000
Term of debt instrument			5 years			5 years
Loans Payable | 2024 Term Loan
Debt Instrument [Line Items]
Total Debt					400,000	$ 400,000	400,000
Term of debt instrument			5 years			5 years
Loans Payable | 2025 Term Loan
Debt Instrument [Line Items]
Total Debt					$ 400,000	$ 400,000	0
Effective interest rate (percent)					1.82%	1.82%
Term of debt instrument			5 years			5 years
Loans Payable | 2025 Term Loan | LIBOR
Debt Instrument [Line Items]
Interest rate spread on the variable rate debt (percent)					1.40%
Loans Payable | 2026 Term Loan
Debt Instrument [Line Items]
Total Debt					$ 150,000	$ 150,000	$ 150,000
Term of debt instrument	7 years		7 years			7 years
Loans Payable | 2026 Term Loan | LIBOR
Debt Instrument [Line Items]
Interest rate spread on the variable rate debt (percent)		1.75%		1.40%
Fixed and Variable Rate Debt
Debt Instrument [Line Items]
Weighted average interest rate of the fixed-rate debt (percent)					3.18%	3.18%
Fixed Rate Debt
Debt Instrument [Line Items]
Weighted average interest rate of the fixed-rate debt (percent)					3.86%	3.86%
Interest Rate Swap
Debt Instrument [Line Items]
Derivative, notional amount					$ 750,000	$ 750,000