Indebtedness Secured Debt (Details) $ in Thousands	12 Months Ended
Dec. 31, 2016 USD ($) loans	Dec. 31, 2015 USD ($) loans	Dec. 31, 2014 USD ($)
Debt Instrument [Line Items]
gross basis of secured properties	$ 848,500
Letters of Credit Outstanding, Amount	2,900
Fair value	3,034,065	$ 3,487,842
Repayments of Secured Debt	354,832	245,665	$ 112,877
Loss on debt extinguishment	(33,934)	(85,713)	$ (283)
Fixed Rate Secured Debt [Member]
Debt Instrument [Line Items]
Fair value	$ 415,231	$ 789,095
Debt Instrument, Interest Rate, Effective Percentage Rate Range, Minimum	2.80%
Debt Instrument, Interest Rate, Effective Percentage Rate Range, Maximum	4.00%
number of secured loans repaid \| loans	7	17
Repayments of Secured Debt	$ 346,700	$ 231,200
Repaid Debt, Weighted Average Interest Rate	5.90%	5.41%
Secured Debt [Member]
Debt Instrument [Line Items]
Loss on debt extinguishment		$ 3,700

gross basis of secured properties

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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.

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- Definition

When presenting a range of interest rates, the highest effective rate for funds borrowed under the debt agreement as of the balance sheet date.

+ 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

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- Definition

When presenting a range of interest rates, the lowest effective rate for funds borrowed under the debt agreement as of the balance sheet date.

+ References

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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.

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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)
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- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
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- 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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- 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
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