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Secured and unsecured senior debt Repayment of secured note payable (Details) (USD $)
In Thousands, unless otherwise specified
0 Months Ended
Jan. 31, 2014
Alexandria Technology Square [Member]
Secured Debt from Insurance Company Maturing on 1 April 2014 [Member]
Sep. 30, 2014
Alexandria Technology Square [Member]
Secured Debt from Insurance Company Maturing on 1 April 2014 [Member]
Sep. 30, 2014
San Diego [Member]
Secured Debt from Bank Maturing on 1 July 2014 [Member]
Aug. 01, 2014
San Diego [Member]
Secured Debt from Bank Maturing on 1 July 2014 [Member]
Sep. 30, 2014
San Diego [Member]
Secured Debt from Bank Maturing on 1 November 2014 [Member]
Aug. 01, 2014
San Diego [Member]
Secured Debt from Bank Maturing on 1 November 2014 [Member]
Debt Instrument [Line Items]            
Outstanding Balance $ 208,700     $ 6,400   $ 7,400
Effective rate (as a percent)   5.59% [1] 4.88% [1]   4.00% [1]  
Proceeds from Contributions from Affiliates $ 20,900          
[1] Represents the weighted average interest rate as of the end of the period plus the impact of debt premiums/discounts and our interest rate swap agreements. The weighted average interest rate excludes bank fees and amortization of loan fees.