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Stockholders' equity (Tables)
 6 Months Ended
Jun. 30, 2019
Stockholders' Equity Note [Abstract]  
Schedule of Accumulated Other Comprehensive Income, Net of Related Taxes
The components of accumulated other comprehensive income (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 income (loss), net of taxes of zero and reclassifications
1,147

 
—

 
1,147

Balance as of June 30, 2019
$
(5,750
)
 
$
(229
)
 
$
(5,979
)