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Debt Obligations, net (Debt Covenants) (Details)	12 Months Ended
	Dec. 31, 2017
Unsecured Credit Facilities
Debt Instrument [Line Items]
Minimum ratio of unencumbered assets to unsecured indebtedness	1.2
Multiple of minimum fixed charges on outstanding borrowings	1.5
2012 Secured Credit Facilities
Debt Instrument [Line Items]
Multiple of the minimum collateral coverage on outstanding borrowings	1.25
2015 Revolving Credit Facility
Debt Instrument [Line Items]
Multiple of minimum fixed charges on outstanding borrowings	1.5
Multiple of the minimum collateral coverage on outstanding borrowings	1.5
Total secured credit facilities and mortgages
Debt Instrument [Line Items]
Percentage of REIT taxable income permitted for distribution under debt convenants	100.00%

X

- Definition

Represents the multiple of the minimum collateral coverage on outstanding borrowings required under the terms of the debt covenant.

+ References

No definition available.

+ Details

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X

- Definition

Debt Instrument, Covenant, Multiple of Minimum Fixed Charges on Outstanding Borrowings

+ References

No definition available.

+ Details

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X

- Definition

Represents the percentage of taxable income that is permitted for distribution, under the terms of the debt covenant, if the entity maintains its REIT qualification.

+ References

No definition available.

+ Details

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X

- Definition

Represents the minimum ratio of encumbered assets to unsecured indebtedness required under the terms of the debt covenant.

+ References

No definition available.

+ Details

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X

- 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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X

- Details

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X

- Details

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X

- Details

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X

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