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Stockholders' equity (Tables)
 3 Months Ended
Mar. 31, 2014
Stockholders' Equity Note [Abstract]  
Accumulated other comprehensive loss attributable to Alexandria Real Estate Equities, Inc.
Accumulated other comprehensive loss attributable to Alexandria Real Estate Equities, Inc. 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, 2013
$
1,590

 
$
(3,321
)
 
$
(34,473
)
 
$
(36,204
)
Other comprehensive income (loss) before reclassifications
18,779

 
5,592

 
(3,106
)
 
21,265

Amounts reclassified from other comprehensive income
—

 
(3,490
)
 
—

 
(3,490
)
Net other comprehensive income (loss)
18,779

 
2,102

 
(3,106
)
 
17,775

Balance as of March 31, 2014
$
20,369

 
$
(1,219
)
 
$
(37,579
)
 
$
(18,429
)