Mortgage and Other Indebtedness - Consolidated Indebtedness by Type of Debt (Details) $ in Thousands		12 Months Ended
Apr. 24, 2018 extension	Dec. 31, 2020 USD ($) extension	Dec. 31, 2019 USD ($)
Participating Mortgage Loans [Line Items]
Principal		$ 1,176,076	$ 1,153,302
Unamortized Net Premiums		1,732	2,176
Unamortized Debt Issuance Costs		(7,014)	(8,898)
Long-term debt		1,170,794	1,146,580
Revolving Credit Facility
Participating Mortgage Loans [Line Items]
Principal		25,000	0
Unamortized Net Premiums		0	0
Unamortized Debt Issuance Costs		(1,672)	(2,625)
Long-term debt		23,328	(2,625)
Line of credit facility, remaining borrowing capacity		$ 523,200	$ 583,400
Basis spread on variable rate (as percent)		1.15%	1.15%
Interest rate, effective percentage (as percent)		1.29%	2.91%
Number of additional extensions \| extension	2	2
Extension period (in years)	6 months	6 months
Senior Unsecured Notes \| Fixed Rate Debt
Participating Mortgage Loans [Line Items]
Principal		$ 550,000	$ 550,000
Unamortized Net Premiums		0	0
Unamortized Debt Issuance Costs		(3,595)	(4,231)
Long-term debt		$ 546,405	$ 545,769
Senior Unsecured Notes \| Fixed Rate Debt \| Minimum
Participating Mortgage Loans [Line Items]
Interest rate during period (as percent)		4.00%	4.00%
Senior Unsecured Notes \| Fixed Rate Debt \| Maximum
Participating Mortgage Loans [Line Items]
Interest rate during period (as percent)		4.57%	4.57%
Unsecured Debt
Participating Mortgage Loans [Line Items]
Principal		$ 250,000	$ 250,000
Unamortized Net Premiums		0	0
Unamortized Debt Issuance Costs		(1,647)	(1,859)
Long-term debt		$ 248,353	$ 248,141
Unsecured Debt \| Unsecured Term Loans, Maturing October 2025
Participating Mortgage Loans [Line Items]
Basis spread on variable rate (as percent)		2.00%	2.00%
Interest rate, effective percentage (as percent)		2.14%	3.76%
Mortgages \| Fixed Rate Debt
Participating Mortgage Loans [Line Items]
Principal		$ 295,966	$ 297,472
Unamortized Net Premiums		1,732	2,176
Unamortized Debt Issuance Costs		(25)	(40)
Long-term debt		$ 297,673	$ 299,608
Mortgages \| Fixed Rate Debt \| Minimum
Participating Mortgage Loans [Line Items]
Interest rate during period (as percent)		3.78%	3.78%
Mortgages \| Fixed Rate Debt \| Maximum
Participating Mortgage Loans [Line Items]
Interest rate during period (as percent)		5.73%	5.73%
Mortgages \| Variable Rate Debt
Participating Mortgage Loans [Line Items]
Principal		$ 55,110	$ 55,830
Unamortized Net Premiums		0	0
Unamortized Debt Issuance Costs		(75)	(143)
Long-term debt		$ 55,035	$ 55,687
Mortgages \| Variable Rate Debt \| Minimum
Participating Mortgage Loans [Line Items]
Basis spread on variable rate (as percent)		1.60%	1.60%
Mortgages \| Variable Rate Debt \| Maximum
Participating Mortgage Loans [Line Items]
Basis spread on variable rate (as percent)		1.74%	3.36%

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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