Mortgage and Other Indebtedness - Consolidated Indebtedness by Type of Debt (Details) - USD ($)	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Participating Mortgage Loans [Line Items]
Principal	$ 1,153,302,000	$ 1,548,770,000
Unamortized Net Premiums	2,176,000	6,566,000
Unamortized Debt Issuance Costs	(8,898,000)	(12,035,000)
Long-term debt	1,146,580,000	1,543,301,000
Revolving Credit Facility
Participating Mortgage Loans [Line Items]
Principal	0	45,600,000
Unamortized Net Premiums	0	0
Unamortized Debt Issuance Costs	(2,625,000)	(3,796,000)
Long-term debt	(2,625,000)	41,804,000
Line of credit facility, remaining borrowing capacity	$ 583,400,000	$ 449,500,000
Basis spread on variable rate (as percent)	1.15%	1.15%
Interest rate, effective percentage (as percent)	2.91%	3.65%
Senior Unsecured Notes \| Fixed Rate Debt
Participating Mortgage Loans [Line Items]
Principal	$ 550,000,000	$ 550,000,000
Unamortized Net Premiums	0	0
Unamortized Debt Issuance Costs	(4,231,000)	(4,864,000)
Long-term debt	$ 545,769,000	$ 545,136,000
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	$ 250,000,000	$ 345,000,000
Unamortized Net Premiums	0	0
Unamortized Debt Issuance Costs	(1,859,000)	(2,470,000)
Long-term debt	$ 248,141,000	$ 342,530,000
Unsecured Debt \| Unsecured Term Loans, Maturing July 2021
Participating Mortgage Loans [Line Items]
Basis spread on variable rate (as percent)	2.00%	1.30%
Interest rate, effective percentage (as percent)	3.76%	3.80%
Debt instrument, face amount		$ 95,000,000
Unsecured Debt \| Unsecured Term Loans, Maturing October 2022
Participating Mortgage Loans [Line Items]
Basis spread on variable rate (as percent)		2.00%
Interest rate, effective percentage (as percent)		4.50%
Debt instrument, face amount		$ 250,000,000
Mortgages \| Fixed Rate Debt
Participating Mortgage Loans [Line Items]
Principal	$ 297,472,000	534,679,000
Unamortized Net Premiums	2,176,000	6,566,000
Unamortized Debt Issuance Costs	(40,000)	(584,000)
Long-term debt	$ 299,608,000	$ 540,661,000
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%	6.78%
Mortgages \| Variable Rate Debt
Participating Mortgage Loans [Line Items]
Principal	$ 55,830,000	$ 73,491,000
Unamortized Net Premiums	0	0
Unamortized Debt Issuance Costs	(143,000)	(321,000)
Long-term debt	$ 55,687,000	$ 73,170,000
Mortgages \| Variable Rate Debt \| Minimum
Participating Mortgage Loans [Line Items]
Interest rate during period (as percent)		4.00%
Basis spread on variable rate (as percent)	1.60%	1.50%
Mortgages \| Variable Rate Debt \| Maximum
Participating Mortgage Loans [Line Items]
Interest rate during period (as percent)		4.10%
Basis spread on variable rate (as percent)	3.36%	1.60%

Long-term Debt, Principal Balance

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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No definition available.

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Face (par) amount of debt instrument at time of issuance.

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The average effective interest rate during the reporting period.

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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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Amount, after accumulated amortization, of debt premium.

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Amount, after accumulated amortization, of debt issuance costs related to line of credit arrangements. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings 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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- Definition

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

No definition available.

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