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Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Segment Information [Abstract]          
Revenues from external customers $ 98,824 $ 115,922 $ 203,343 $ 227,229  
Net income (loss) 7,038 5,827 12,947 11,334  
Total assets 264,758 278,730 264,758 278,730 259,461
Metal Bearing Components Segment [Member]
          
Segment Information [Abstract]          
Revenues from external customers 65,768 84,827 137,898 168,609  
Net income (loss) 6,250 8,898 13,215 18,729  
Total assets 198,615 208,313 198,615 208,313  
Precision Metal Components Segment [Member]
          
Segment Information [Abstract]          
Revenues from external customers 22,561 19,534 43,873 35,936  
Net income (loss) 1,911 (1,130) 3,550 (3,338)  
Total assets 41,490 44,703 41,490 44,703  
Plastic and Rubber Components Segment [Member]
          
Segment Information [Abstract]          
Revenues from external customers 10,495 11,561 21,572 22,684  
Net income (loss) 800 918 1,760 1,736  
Total assets 21,249 21,559 21,249 21,559  
Corporate and Consolidations [Member]
          
Segment Information [Abstract]          
Net income (loss) (1,923) (2,859) (5,578) (5,793)  
Total assets $ 3,404 $ 4,155 $ 3,404 $ 4,155