Restructuring Costs (Details 3) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	$ 625	$ 1,431	$ 1,361
Total COGS and SGA
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	600	1,400	1,361
2013 Realignment Program | Facility Exit [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Beginning	0	321	1,485
Restructuring expenses	0	22	437
Utilization	0	(343)	(1,601)
Restructuring Reserve, Ending	0	0	321
2013 Realignment Program | Total COGS and SGA
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Beginning	1,841	3,777	12,426
Restructuring expenses	23	664	1,361
Utilization	(133)	(2,600)	(10,010)
Restructuring Reserve, Ending	1,731	1,841	3,777
2013 Realignment Program | Total COGS and SGA | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Beginning	1,841	3,456	10,941
Restructuring expenses	23	642	924
Utilization	(133)	(2,257)	(8,409)
Restructuring Reserve, Ending	$ 1,731	$ 1,841	$ 3,456