Indebtedness Secured Debt (Details) $ in Thousands	12 Months Ended
Dec. 31, 2017 USD ($) loans	Dec. 31, 2016 USD ($) loans	Dec. 31, 2015 USD ($)
Debt Instrument [Line Items]
gross basis of secured properties	$ 752,100
Letters of Credit Outstanding, Amount	2,600
Fair value	$ 2,518,801	$ 3,034,065
Debt Instrument, Interest Rate, Effective Percentage	3.39%	3.36%
Repayments of Secured Debt	$ 72,648	$ 354,832	$ 245,665
Fixed Rate Secured Debt [Member]
Debt Instrument [Line Items]
Fair value	$ 325,753	$ 415,231
number of secured loans repaid \| loans	8	7
Repayments of Secured Debt	$ 66,500	$ 346,700
Repaid Debt, Weighted Average Interest Rate	5.85%	5.90%
Minimum [Member] \| Fixed Rate Secured Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	3.60%
Maximum [Member] \| Fixed Rate Secured Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	3.90%

gross basis of secured properties

No definition available.

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- Definition

number of secured loans repaid

+ References

No definition available.

+ Details

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- Definition

Repaid Debt, Weighted Average Interest Rate

+ References

No definition available.

+ Details

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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ 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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

+ 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

Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

+ Details

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Period Type:	instant

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The cash outflow to repay long-term debt that is wholly or partially secured by collateral. Excludes repayments of tax exempt secured debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585

+ Details

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