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Comprehensive loss (Tables)
 12 Months Ended
Dec. 31, 2018
Stockholders' Equity Note [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
The components of accumulated other comprehensive income (loss) as of December 31, 2018 and 2017, and reclassifications out of other comprehensive income (loss) for the years then ended, are presented below (in thousands):
 
 
 
Pension Liability

Adjustment
 
 
Fair Value of

Derivatives
 
 
Foreign Currency

Translation

Adjustment
 
 
Accumulated Other

Comprehensive

Income (Loss)
 
Balance at January 1, 2018
 
$
1,191
 
 
$
342
 
 
$
(687
)
 
$
846
 
Other comprehensive loss before reclassifications, net of taxes
 
 
-
 
 
 
(695
)
 
 
(779
)
 
 
(1,474
)
Total other comprehensive income (loss) before reclassifications, net of taxes
 
 
1,191
 
 
 
(353
)
 
 
(1,466
)
 
 
(628
)
Net amount reclassified to earnings
 
 
260
 
 
 
353
 
 
 
-
 
 
 
613
 
Balance at December 31, 2018
 
$
1,451
 
 
$
-
 
 
$
(1,466
)
 
$
(15
)
 
 
 
Pension Liability

Adjustment
 
 
Fair Value of

Derivatives
 
 
Foreign Currency

Translation

Adjustment
 
 
Accumulated Other

Comprehensive

Income (Loss)
 
Balance at January 1, 2017
 
$
1,387
 
 
$
(318
)
 
$
(1,393
)
 
$
(324
)
Other comprehensive income before reclassifications, net of taxes
 
 
-
 
 
 
574
 
 
 
706
 
 
 
1,280
 
Total other comprehensive income (loss) before reclassifications, net of taxes
 
 
1,387
 
 
 
256
 
 
 
(687
)
 
 
956
 
Net amount reclassified to earnings
 
 
(196
)
 
 
86
 
 
 
-
 
 
 
(110
)
Balance at December 31, 2017
 
$
1,191
 
 
$
342
 
 
$
(687
)
 
$
846