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Stockholders' equity (Tables)
 9 Months Ended
Sep. 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
323

 
(704
)
 
(26,378
)
 
(26,759
)
Amounts reclassified from other comprehensive income
(480
)
 
12,046

 
—

 
11,566

Net other comprehensive (loss) income
(157
)
 
11,342

 
(26,378
)
 
(15,193
)
Balance as of September 30, 2013
$
1,316

 
$
(9,319
)
 
$
(32,023
)
 
$
(40,026
)