Extinguishment of debt, number of transactions

No definition available.

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Data Type:	xbrli:integerItemType
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Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

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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://www.xbrl.org/2003/role/presentationRef
-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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Period Type:	instant

- 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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Period Type:	duration

- 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))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_MortgagesMember
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- Details

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- Details

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- Details

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Notes and Bonds Payable (Details)	3 Months Ended	12 Months Ended
Notes and Bonds Payable (Details)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)	Dec. 11, 2017	Dec. 31, 2016 USD ($)	Apr. 24, 2015	Mar. 26, 2013
Debt Instrument [Line Items]
Notes and bonds payable	$ 1,283,880,000	$ 1,283,880,000		$ 1,264,370,000
Line of Credit [Member] \| Unsecured Credit Facility [Member]
Debt Instrument [Line Items]
Notes and bonds payable	189,000,000	189,000,000		107,000,000
Medium-term Notes [Member] \| Unsecured Term Loan due 2022 [Member]
Debt Instrument [Line Items]
Notes and bonds payable	$ 148,994,000	$ 148,994,000		149,491,000
Contractual interest rates, basis spread on variable rate		1.10%
Senior Notes [Member] \| Senior Notes due 2021 [Member]
Debt Instrument [Line Items]
Extinguishment of debt, number of transactions	2
Notes and bonds payable	$ 0	$ 0		397,147,000
Contractual interest rates	5.75%	5.75%
Senior Notes [Member] \| Senior Notes due 2023 [Member]
Debt Instrument [Line Items]
Notes and bonds payable	$ 247,703,000	$ 247,703,000		247,296,000
Contractual interest rates	3.75%	3.75%				3.75%
Senior Notes [Member] \| Senior Notes due 2025 [Member]
Debt Instrument [Line Items]
Notes and bonds payable	$ 248,044,000	$ 248,044,000		247,819,000
Contractual interest rates	3.88%	3.88%			3.875%
Senior Notes [Member] \| Senior Notes due 2028 [Member]
Debt Instrument [Line Items]
Notes and bonds payable	$ 294,757,000	$ 294,757,000		0
Contractual interest rates	3.63%	3.63%	3.625%
Mortgage Notes [Member] \| Mortgage notes payable [Member]
Debt Instrument [Line Items]
Notes and bonds payable	$ 155,382,000	$ 155,382,000		$ 115,617,000
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] \| Unsecured 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] \| Unsecured 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%	3.30%
Minimum [Member] \| Mortgage Notes [Member] \| Mortgage notes payable [Member]
Debt Instrument [Line Items]
Contractual interest rates	3.31%	3.31%
Maximum [Member] \| Medium-term Notes [Member] \| Unsecured 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%	6.90%
Maximum [Member] \| Mortgage Notes [Member] \| Mortgage notes payable [Member]
Debt Instrument [Line Items]
Contractual interest rates	6.88%	6.88%