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Debt - Schedule of Debt (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 02, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Total principal	$ 2,086,233,000		$ 1,979,072,000
Unamortized Deferred Financing Costs and Discounts, net	(9,416,000)		(9,968,000)
Total Debt, net	2,076,817,000		1,969,104,000
Interest Rate Swap
Debt Instrument [Line Items]
Derivative notional amount	750,000,000
LIBOR
Debt Instrument [Line Items]
Effective interest rate (percent)		1.58%
Mortgages
Debt Instrument [Line Items]
Total principal	$ 1,034,733,000		1,017,572,000
Fixed and variable rate debt | Interest Rate Swap
Debt Instrument [Line Items]
Weighted average interest rate	3.66%
Fixed rate debt | Interest Rate Swap
Debt Instrument [Line Items]
Weighted average interest rate	3.62%
HealthSpring Mortgage Loan | Mortgages
Debt Instrument [Line Items]
Total principal	$ 20,595,000		20,723,000
Contractual stated interest rate (percent)	4.18%
Effective interest rate (percent)	4.61%
Midland Mortgage Loan | Mortgages
Debt Instrument [Line Items]
Total principal			100,249,000
Contractual stated interest rate (percent)	3.94%
Effective interest rate (percent)	4.12%
Emporia Partners Mortgage Loan | Mortgages
Debt Instrument [Line Items]
Total principal	$ 1,987,000		2,104,000
Contractual stated interest rate (percent)	5.88%
Effective interest rate (percent)	5.97%
Samsonite | Mortgages
Debt Instrument [Line Items]
Total principal	$ 20,912,000		21,154,000
Contractual stated interest rate (percent)	6.08%
Effective interest rate (percent)	5.13%
Highway 94 loan | Mortgages
Debt Instrument [Line Items]
Total principal			15,610,000
Contractual stated interest rate (percent)	3.75%
Effective interest rate (percent)	4.74%
Pepsi Bottling Ventures Loan | Mortgages
Debt Instrument [Line Items]
Total principal	$ 18,855,000		0
Contractual stated interest rate (percent)	3.69%
Effective interest rate (percent)	3.91%
AIG Loan II | Mortgages
Debt Instrument [Line Items]
Total principal			126,970,000
Contractual stated interest rate (percent)	4.15%
Effective interest rate (percent)	4.92%
BOA Loan | Mortgages
Debt Instrument [Line Items]
Total principal			375,000,000
Contractual stated interest rate (percent)	3.77%
Effective interest rate (percent)	3.91%
BOA/KeyBank Loan | Mortgages
Debt Instrument [Line Items]
Contractual stated interest rate (percent)	4.32%
Effective interest rate (percent)	4.14%
AIG Loan | Mortgages
Debt Instrument [Line Items]
Total principal			105,762,000
Contractual stated interest rate (percent)	4.96%
Effective interest rate (percent)	5.08%
Revolving Credit Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Total principal	$ 301,500,000		211,500,000
Effective interest rate (percent)	3.15%
Spread on LIBOR (percent)	1.45%
Initial debt instrument term	3 years
Debt instrument extended term	1 year
2023 Term Loan
Debt Instrument [Line Items]
Effective interest rate (percent)	3.08%
2023 Term Loan | Term Loans
Debt Instrument [Line Items]
Total principal	$ 200,000,000		200,000,000
Spread on LIBOR (percent)	1.40%
2024 Term Loan
Debt Instrument [Line Items]
Effective interest rate (percent)	3.07%
2024 Term Loan | Term Loans
Debt Instrument [Line Items]
Total principal	$ 400,000,000		400,000,000
Spread on LIBOR (percent)	1.40%
2026 Term Loan
Debt Instrument [Line Items]
Effective interest rate (percent)	3.39%
2026 Term Loan | Term Loans
Debt Instrument [Line Items]
Total principal	$ 150,000,000		$ 150,000,000
Spread on LIBOR (percent)	1.75%

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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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Amount of unamortized debt discount (premium) and debt issuance costs.

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Weighted average interest rate of debt outstanding.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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