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Stockholders' equity (Tables)
 6 Months Ended
Jun. 30, 2013
Stockholders' Equity Note [Abstract]  
Accumulated other comprehensive loss attributable to Alexandria Real Estate Equities, Inc.
Accumulated other comprehensive loss attributable to Alexandria consists of the following (in thousands):

 
Unrealized Gain on Marketable Securities
 
Unrealized Loss on Interest Rate
Swap Agreements
 
Unrealized Loss on Foreign Currency Translation
 
Total
Balance as of December 31, 2012
$
1,473

 
$
(20,661
)
 
$
(5,645
)
 
$
(24,833
)
Other comprehensive income (loss) before reclassifications
360

 
(28
)
 
(22,976
)
 
(22,644
)
Amounts reclassified from other comprehensive income
(230
)
 
8,142

 
—

 
7,912

Net other comprehensive income (loss)
130

 
8,114

 
(22,976
)
 
(14,732
)
Balance as of June 30, 2013
$
1,603

 
$
(12,547
)
 
$
(28,621
)
 
$
(39,565
)