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Significant Accounting Policies - Discontinued Operations, Cash, Rent Receivables (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Discontinued Operations
Time period within which sale or disposition of properties held for sale is probable	1 year
Tenant Rent Receivables and Straight-line Rent Receivable
Period within which tenant rent receivables are expected to be collected	1 year
Straight-line rent receivable	$ 48,502,000	$ 47,021,000
Allowance for doubtful accounts - Tenant rent receivables
Allowance for doubtful accounts activity
Receivables written-off	89,000	119,000	$ 1,237,000
Increase (decrease) in allowance	(106,000)	394,000	(13,000)
Allowance for doubtful accounts - Straight-line rent receivable
Allowance for doubtful accounts activity
Receivables written-off	112,000		48,000
Increase (decrease) in allowance	$ (112,000)	$ 27,000	$ 48,000

X

- Definition

Represents deferred rent receivables net including amounts for assets held for sale.

+ References

No definition available.

+ Details

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- Definition

Represents the maximum time period within which the sale or disposal of disposal group is expected.

+ References

No definition available.

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- Definition

Represents the maximum period within which receivables are expected to be collected.

+ References

No definition available.

+ Details

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- References

No definition available.

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No definition available.

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- Definition

Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, charged to costs and expenses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 09
-Article 12

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- Definition

Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 09
-Article 12

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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.

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