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Investments in Unconsolidated Joint Ventures Business acquisition purchase price table (Details) - Colorado Center [Member] - Colorado Center [Member] $ in Thousands	Jul. 01, 2016 USD ($)
Schedule of Equity Method Investments [Line Items]
Land	$ 189,597
Site Improvements	9,050
Buildings and improvements	259,592
Tenant Improvements	17,234
In-place lease intangibles	43,157
Above-market lease, acquired	819
Below-market lease, acquired	(16,461)
Net assets acquired	$ 502,988

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