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Consolidated financial statement details - Prepaid expenses and other current assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
other receivable [Line Items]    
Prepaid expenses $ 6,132 $ 3,905
Prepaid income taxes 4,696 26,504
Prepaid licenses 2,818 2,053
Current deferred tax assets 0 24,218
Other current assets 7,366 7,089
Prepaid expenses and other current assets 25,261 63,769
Building Improvements [Member]    
other receivable [Line Items]    
Tenant allowance receivable $ 4,249 $ 0