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Stockholders' equity (Tables)
 9 Months Ended
Sep. 30, 2015
Stockholders' Equity Note [Abstract]  
Accumulated other comprehensive loss attributable to Alexandria Real Estate Equities, Inc.
Accumulated other comprehensive income (loss) attributable to Alexandria consists of the following (in thousands):
 
 
Unrealized Gains on Marketable Securities
 
Unrealized Losses on Interest Rate Swap Agreements
 
Unrealized Losses on Foreign Currency Translation
 
Total
Balance as of December 31, 2014
 
$
52,367

 
$
(909
)
 
$
(52,086
)
 
$
(628
)
 
 
 
 
 
 
 
 
 
Other comprehensive income (loss) before reclassifications
 
54,004

 
(9,712
)
 
(17,072
)
 
27,220

Amounts reclassified from other comprehensive (loss) income
 
(2,503
)
 
1,942

 
9,236

 
8,675

 
 
51,501

 
(7,770
)
 
(7,836
)
 
35,895

Amounts attributable to noncontrolling interest
 
—

 
—

 
(29
)
 
(29
)
Net other comprehensive income (loss)
 
51,501

 
(7,770
)
 
(7,865
)
 
35,866

 
 
 
 
 
 
 
 
 
Balance as of September 30, 2015
 
$
103,868

 
$
(8,679
)
 
$
(59,951
)
 
$
35,238