Business Segments (Tables)

12 Months Ended

Dec. 31, 2016

Business Segments [Abstract]

Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country [Table Text Block]

Geographic information
Net sales by geographic location is the following:
Year Ended December 31,	2016		2015		2014
(Dollars in thousands)
Net sales:
U.S.	$	120,395	$	177,198	$	261,478
Mexico	612,282		550,748		483,969
Consolidated net sales	$	732,677	$	727,946	$	745,447

Long Lived Assets
Long-lived assets includes property, plant and equipment, net, by geographic location as follows:
December 31,	2016		2015
(Dollars in thousands)
Property, plant and equipment, net:
U.S.	$	37,795	$	44,274
Mexico	189,608		190,372
Consolidated property, plant and equipment, net	$	227,403	$	234,646

Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]

Geographic information
Net sales by geographic location is the following:
Year Ended December 31,	2016		2015		2014
(Dollars in thousands)
Net sales:
U.S.	$	120,395	$	177,198	$	261,478
Mexico	612,282		550,748		483,969
Consolidated net sales	$	732,677	$	727,946	$	745,447