Notes and Bonds Payable - Mortgage Notes (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Issuance costs	$ (5,841)
Notes and bonds payable	1,414,069	$ 1,345,984
Mortgage Notes [Member]
Debt Instrument [Line Items]
Issuance costs	(500)
Mortgage Notes Payable [Member] \| Mortgage Notes [Member]
Debt Instrument [Line Items]
Mortgage notes	129,258	143,115
Unamortized premium	1,162	1,805
Unaccreted discount	(528)	(968)
Issuance costs	(549)	(744)
Notes and bonds payable	$ 129,343	$ 143,208

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

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Amount, after accumulated amortization, of debt discount.

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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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