Notes and Bonds Payable - Mortgage Notes (Details) $ in Thousands	Dec. 31, 2017 USD ($) mortgage_note_payable	Dec. 31, 2016 USD ($)
Debt Instrument [Line Items]
Issuance costs	$ (7,488)
Notes and bonds payable	$ 1,283,880	$ 1,264,370
Number of Outstanding Mortgage Notes \| mortgage_note_payable	18
Mortgage Notes [Member]
Debt Instrument [Line Items]
Issuance costs	$ (900)
Number of Outstanding Mortgage Notes \| mortgage_note_payable	19
Mortgage notes payable [Member] \| Mortgage Notes [Member]
Debt Instrument [Line Items]
Mortgage notes	$ 154,916	114,934
Unamortized premium	2,651	2,569
Unaccreted discount	(1,332)	(1,450)
Issuance costs	(853)	(436)
Notes and bonds payable	155,382	$ 115,617
Municipal Government [Member] \| Mortgage Notes 4.79% [Member] \| Mortgage Notes [Member]
Debt Instrument [Line Items]
Mortgage notes	11,000
Unamortized premium	$ 1,000
Number of Outstanding Mortgage Notes \| mortgage_note_payable	3

Number of outstanding mortgage notes.

No definition available.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
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-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

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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.

+ Details

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- Definition

Amount, after accumulated amortization, of debt discount.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

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- Definition

Amount, after accumulated amortization, of debt premium.

+ References

+ Details

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section S99
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
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- Details

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- Details

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- Details

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- Details

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