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

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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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 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/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(3)
-URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
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Period Type:	instant

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- Details

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Notes and Bonds Payable (Details) - USD ($) $ in Thousands	12 Months Ended
Notes and Bonds Payable (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 11, 2017	Apr. 24, 2015	Mar. 26, 2013
Debt Instrument [Line Items]
Notes and bonds payable	$ 1,345,984	$ 1,283,880
Line of Credit [Member] \| Unsecured Credit Facility [Member]
Debt Instrument [Line Items]
Notes and bonds payable	262,000	189,000
Medium-term Notes [Member] \| Term Loan due 2022 [Member]
Debt Instrument [Line Items]
Notes and bonds payable	$ 149,183	148,994
Contractual interest rates, basis spread on variable rate	1.10%
Senior Notes [Member] \| Senior Notes due 2023 [Member]
Debt Instrument [Line Items]
Notes and bonds payable	$ 248,117	247,703
Contractual interest rates	3.75%				3.75%
Senior Notes [Member] \| Senior Notes due 2025 [Member]
Debt Instrument [Line Items]
Notes and bonds payable	$ 248,278	248,044
Contractual interest rates	3.88%			3.875%
Senior Notes [Member] \| Senior Notes due 2028 [Member]
Debt Instrument [Line Items]
Notes and bonds payable	$ 295,198	294,757
Contractual interest rates	3.63%		3.625%
Mortgage Notes [Member] \| Mortgage notes payable [Member]
Debt Instrument [Line Items]
Notes and bonds payable	$ 143,208	$ 155,382
LIBOR [Member] \| Line of Credit [Member] \| Unsecured Credit Facility [Member]
Debt Instrument [Line Items]
Contractual interest rates, basis spread on variable rate	1.00%
LIBOR [Member] \| Medium-term Notes [Member] \| Term Loan due 2022 [Member]
Debt Instrument [Line Items]
Contractual interest rates, basis spread on variable rate	1.10%
Minimum [Member] \| Medium-term Notes [Member] \| Term Loan due 2022 [Member]
Debt Instrument [Line Items]
Contractual interest rates, basis spread on variable rate	0.90%
Minimum [Member] \| Mortgage Notes [Member]
Debt Instrument [Line Items]
Contractual interest rates	3.30%
Minimum [Member] \| Mortgage Notes [Member] \| Mortgage notes payable [Member]
Debt Instrument [Line Items]
Contractual interest rates	3.31%
Maximum [Member] \| Medium-term Notes [Member] \| Term Loan due 2022 [Member]
Debt Instrument [Line Items]
Contractual interest rates, basis spread on variable rate	1.75%
Maximum [Member] \| Mortgage Notes [Member]
Debt Instrument [Line Items]
Contractual interest rates	6.90%
Maximum [Member] \| Mortgage Notes [Member] \| Mortgage notes payable [Member]
Debt Instrument [Line Items]
Contractual interest rates	6.88%