Segment Reporting - Schedule of Segment Reporting Information, by Segment (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015 Segments	Mar. 31, 2014
Segment Reporting Information [Line Items]
Number of Reportable Segments	2us-gaap_NumberOfReportableSegments
Segment Reporting Information, Profit (Loss) [Abstract]
Revenue	$ 62,824us-gaap_RealEstateRevenueNet	$ 55,596us-gaap_RealEstateRevenueNet
Net operating income	13,326us-gaap_OperatingIncomeLoss	11,220us-gaap_OperatingIncomeLoss
Office Properties
Segment Reporting Information, Profit (Loss) [Abstract]
Revenue	52,935	46,060
Operating expenses	17,135	15,927
Media and Entertainment Properties
Segment Reporting Information, Profit (Loss) [Abstract]
Revenue	9,889	9,536
Operating expenses	6,005	6,005
Operating Segments
Segment Reporting Information, Profit (Loss) [Abstract]
Revenue	62,824	55,596
Operating expenses	23,140	21,932
Net operating income	39,684	33,664
Operating Segments \| Office Properties
Segment Reporting Information, Profit (Loss) [Abstract]
Revenue	52,935	46,060
Operating expenses	17,135	15,927
Net operating income	35,800	30,133
Operating Segments \| Media and Entertainment Properties
Segment Reporting Information, Profit (Loss) [Abstract]
Revenue	9,889	9,536
Operating expenses	6,005	6,005
Net operating income	$ 3,884	$ 3,531

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

No definition available.

+ Details

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- Definition

The net result for the period of deducting operating expenses from operating revenues.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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- Definition

The total amount of other operating cost and expense items that are associated with the entity's normal revenue producing operation.

+ References

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 210.5-03.3)

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

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Balance Type:	debit
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- Definition

The aggregate revenue from real estate operations during the reporting period.

+ References

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

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- Details

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- Details

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