Notes Payable - Restricted Cash By Investment (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	$ 17,319	$ 14,244
Secured Debt
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	17,267	13,024
Secured Debt \| Rincon Center
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	13,767	9,716
Secured Debt \| 10950 Washington
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	889	775
Secured Debt \| Pinnacle I
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	1,772	2,099
Secured Debt \| Pinnacle II
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	$ 839	$ 434

The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element.

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 210.5-02.1)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_RestrictedCashAndCashEquivalents
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant