Net Sales and Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Product Information [Line Items]
Net Sales	$ 212,055	$ 194,909
North America [Member]
Product Information [Line Items]
Net Sales	91,820	87,341
EMEA [Member]
Product Information [Line Items]
Net Sales	62,055	53,927
Asia Pacific [Member]
Product Information [Line Items]
Net Sales	48,777	45,150
South America [Member]
Product Information [Line Items]
Net Sales	9,403	$ 8,491
Transferred At Point In Time [Member]
Product Information [Line Items]
Net Sales	207,152
Transferred At Point In Time [Member] | North America [Member]
Product Information [Line Items]
Net Sales	88,986
Transferred At Point In Time [Member] | EMEA [Member]
Product Information [Line Items]
Net Sales	61,999
Transferred At Point In Time [Member] | Asia Pacific [Member]
Product Information [Line Items]
Net Sales	46,848
Transferred At Point In Time [Member] | South America [Member]
Product Information [Line Items]
Net Sales	9,319
Transferred Over Time [Member]
Product Information [Line Items]
Net Sales	4,903
Transferred Over Time [Member] | North America [Member]
Product Information [Line Items]
Net Sales	2,834
Transferred Over Time [Member] | EMEA [Member]
Product Information [Line Items]
Net Sales	56
Transferred Over Time [Member] | Asia Pacific [Member]
Product Information [Line Items]
Net Sales	1,929
Transferred Over Time [Member] | South America [Member]
Product Information [Line Items]
Net Sales	84
Primary Metals [Member]
Product Information [Line Items]
Net Sales	104,767
Primary Metals [Member] | North America [Member]
Product Information [Line Items]
Net Sales	41,273
Primary Metals [Member] | EMEA [Member]
Product Information [Line Items]
Net Sales	27,317
Primary Metals [Member] | Asia Pacific [Member]
Product Information [Line Items]
Net Sales	30,878
Primary Metals [Member] | South America [Member]
Product Information [Line Items]
Net Sales	5,299
Metalworking [Member]
Product Information [Line Items]
Net Sales	89,391
Metalworking [Member] | North America [Member]
Product Information [Line Items]
Net Sales	36,874
Metalworking [Member] | EMEA [Member]
Product Information [Line Items]
Net Sales	31,161
Metalworking [Member] | Asia Pacific [Member]
Product Information [Line Items]
Net Sales	17,573
Metalworking [Member] | South America [Member]
Product Information [Line Items]
Net Sales	3,783
Coatings And Other [Member]
Product Information [Line Items]
Net Sales	17,897
Coatings And Other [Member] | North America [Member]
Product Information [Line Items]
Net Sales	13,673
Coatings And Other [Member] | EMEA [Member]
Product Information [Line Items]
Net Sales	3,577
Coatings And Other [Member] | Asia Pacific [Member]
Product Information [Line Items]
Net Sales	326
Coatings And Other [Member] | South America [Member]
Product Information [Line Items]
Net Sales	$ 321