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Partnership Interest Narrative (Details) - 444 West Santa Clara Street, L.P. [Member] - USD ($)
$ in Thousands
12 Months Ended
Jan. 10, 2017
Dec. 31, 2016
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]    
Limited partership interest percentage   70.00%
Subsequent Event [Member]    
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]    
Proceeds from Sale of Real Estate Held-for-investment $ 11,000