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_
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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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- 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/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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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

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- Details

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Notes and Bonds Payable (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
Notes and Bonds Payable (Details) - USD ($) $ in Thousands	Feb. 28, 2014	Dec. 31, 2016	Dec. 31, 2015	Mar. 26, 2013	Dec. 13, 2010
Debt Instrument [Line Items]
Notes and bonds payable		$ 1,264,370	$ 1,424,992
Line of Credit [Member] \| Unsecured Credit Facility Due 2020 [Member]
Debt Instrument [Line Items]
Notes and bonds payable		107,000	206,000
Medium-term Notes [Member] \| Unsecured Term Loan Due 2019 [Member]
Debt Instrument [Line Items]
Notes and bonds payable		149,491	$ 199,257
Contractual interest rates, basis spread on variable rate			1.20%
Senior Notes [Member] \| 5.750% Senior Notes Due 2021 [Member]
Debt Instrument [Line Items]
Notes and bonds payable		$ 397,147	$ 396,489
Contractual interest rates		5.75%			5.75%
Senior Notes [Member] \| 3.75% Senior Notes Due 2023 [Member]
Debt Instrument [Line Items]
Notes and bonds payable		$ 247,296	246,897
Contractual interest rates		3.75%		3.75%
Senior Notes [Member] \| 3.88% Unsecured Senior Notes due 2025 [Member]
Debt Instrument [Line Items]
Notes and bonds payable		$ 247,819	247,602
Contractual interest rates		3.88%
Mortgage notes payable [Member]
Debt Instrument [Line Items]
Notes and bonds payable		$ 115,617	$ 128,747
LIBOR [Member] \| Line of Credit [Member] \| Unsecured Credit Facility Due 2020 [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 2019 [Member]
Debt Instrument [Line Items]
Contractual interest rates, basis spread on variable rate		1.20%
Minimum [Member] \| Medium-term Notes [Member] \| Unsecured Term Loan Due 2019 [Member]
Debt Instrument [Line Items]
Contractual interest rates, basis spread on variable rate	1.00%
Minimum [Member] \| Mortgage notes payable [Member]
Debt Instrument [Line Items]
Contractual interest rates		3.60%
Maximum [Member] \| Medium-term Notes [Member] \| Unsecured Term Loan Due 2019 [Member]
Debt Instrument [Line Items]
Contractual interest rates, basis spread on variable rate	1.95%
Maximum [Member] \| Mortgage notes payable [Member]
Debt Instrument [Line Items]
Contractual interest rates		6.88%