Comprehensive income (loss) (Tables)

12 Months Ended

Dec. 31, 2016

Stockholders' Equity Note [Abstract]

Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]

The components of accumulated other comprehensive loss as of December 31, 2016 and 2015, and reclassifications out of other comprehensive income (loss) for the years then ended, are presented below (in thousands):

					Foreign Currency
	Pension Liability		Fair Value of		Translation		Accumulated Other
	Adjustment		Derivatives		Adjustment		Comprehensive 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)

					Foreign Currency
	Pension Liability		Fair Value of		Translation		Accumulated Other
	Adjustment		Derivatives		Adjustment		Comprehensive Loss
Balance at January 1, 2015	$	497	$	(337)	$	(447)	$	(287)
Other comprehensive income (loss) before reclassifications, net of taxes		1,110		(51)		(995)		64
Total other comprehensive income (loss) before reclassifications, net of taxes		1,607		(388)		(1,442)		(223)
Net amount reclassified to earnings		(84)		223		-		139
Balance at December 31, 2015	$	1,523	$	(165)	$	(1,442)	$	(84)