Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1(e))

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Related Parties

-URI http://asc.fasb.org/extlink&oid=16382449

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 946

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.6-07.1(c))

-URI http://asc.fasb.org/extlink&oid=6488393&loc=d3e606610-122999

Name:	us-gaap_RevenueFromRelatedParties
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Related Party Transactions (Details) $ in Thousands	3 Months Ended		6 Months Ended
Related Party Transactions (Details) $ in Thousands	Jun. 30, 2015 USD ($) ft² property	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) ft² property	Jun. 30, 2014 USD ($)
Related Party Transaction [Line Items]
Area of real estate property	10,000,000		10,000,000
Affiliated Entities \| Supervisory Fee Revenue
Related Party Transaction [Line Items]
Revenue from related parties \| $	$ 500	$ 600	$ 900	$ 1,100
Affiliated Entities \| Property Management Fee Revenue
Related Party Transaction [Line Items]
Revenue from related parties \| $	100	100	200	200
Affiliated Entities \| Leased space rental
Related Party Transaction [Line Items]
Revenue from related parties \| $	$ 50	$ 100	$ 50	$ 100
Area of real estate property	3,074		3,074
Number of properties \| property	1		1
Undivided Interest
Related Party Transaction [Line Items]
Area of real estate property	647		647