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Stockholders' equity (Tables)
 9 Months Ended
Sep. 30, 2019
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
 
Defined Benefit Pension Plan Adjustment
 
Total Accumulated Other Comprehensive Income (loss)
Balance as of December 31, 2018
$
(6,897
)
 
$
(229
)
 
$
(7,126
)
Other comprehensive loss, net of taxes of zero
(3,468
)
 
—

 
(3,468
)
Balance as of September 30, 2019
$
(10,365
)
 
$
(229
)
 
$
(10,594
)