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Stockholders' equity (Tables)
 9 Months Ended
Sep. 30, 2017
Stockholders' Equity Note [Abstract]  
Schedule of Accumulated Other Comprehensive Income, Net of Related Taxes
The components of accumulated other comprehensive loss, net of related taxes, were as follows (in thousands):
 
Foreign Currency Translation Adjustments
 
Unrealized Gain (Loss) on Available-For-Sale Securities
 
Defined Benefit Pension Plan Adjustment
 
Total Accumulated Other Comprehensive Loss
Balance as of December 31, 2016
$
(8,235
)
 
$
(19
)
 
$
(147
)
 
$
(8,401
)
Other comprehensive income, net of taxes of zero and reclassifications
6,090

 
17

 
—

 
6,107

Balance as of September 30, 2017
$
(2,145
)
 
$
(2
)
 
$
(147
)
 
$
(2,294
)