Comprehensive income (loss) (Tables)

12 Months Ended

Dec. 31, 2017

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, 2017 and 2016, 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, 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

	Pension Liability Adjustment		Fair Value of Derivatives		Foreign Currency Translation Adjustment		Accumulated Other Comprehensive Income (Loss)
Balance at January 1, 2016	$	1,523	$	(165)	$	(1,442)	$	(84)
Other comprehensive income (loss) before reclassifications, net of taxes		-		(90)		49		(41)
Total other comprehensive income (loss) before reclassifications, net of taxes		1,523		(255)		(1,393)		(125)
Net amount reclassified to earnings		(136)		(63)		-		(199)
Balance at December 31, 2016	$	1,387	$	(318)	$	(1,393)	$	(324)