Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Segment Information
Revenues from external customers	$ 93,797	$ 104,519
Net income (loss)	2,871	5,909
Total assets	264,647	274,214	265,343
Metal Bearing Components Segment [Member]
Segment Information
Revenues from external customers	63,688	72,130
Net income (loss)	4,024	6,934
Total assets	192,768	205,572
Precision Metal Components Segment [Member]
Segment Information
Revenues from external customers	20,743	21,312
Net income (loss)	932	1,639
Total assets	43,774	43,761
Plastic and Rubber Components Segment [Member]
Segment Information
Revenues from external customers	9,366	11,077
Net income (loss)	105	961
Total assets	19,945	21,254
Corporate and Consolidations [Member]
Segment Information
Revenues from external customers
Net income (loss)	(2,190)	(3,625)
Total assets	$ 8,160	$ 3,627