Investment in Unconsolidated Joint Ventures (Terminus Office Holdings LLC) (Details) (Terminus Office Holdings [Member], USD $)	12 Months Ended
Dec. 31, 2014	Feb. 28, 2013
Schedule of Equity Method Investments [Line Items]
Ownership Percentage of Partner in Joint Venture		50.00%
Debt Instrument, Face Amount		$ 82,000,000us-gaap_DebtInstrumentFaceAmount
Equity Method Investments Summarized Financial Information Cash	7,900,000
Secured Mortgage Note Payable [Member]
Schedule of Equity Method Investments [Line Items]
Debt Instrument, Face Amount	$ 213,600,000
Mortgage Loans on Real Estate, Final Maturity Date	Jan. 01, 2023
Long-term Debt, Weighted Average Interest Rate	4.69%
Office Building [Member]
Schedule of Equity Method Investments [Line Items]
Number of Real Estate Properties Owned by Equity Investee	2
Institutional investors advised by J.P. Morgan Asset Management [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Percentage of Partner in Joint Venture	50.00%

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

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-Name Accounting Standards Codification

-Topic 205

-SubTopic 10

-Section S99

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-Subparagraph (SX 210.5-04.(c) Schedule IV)

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