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Segment Information (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Segment Information |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 370,084 | $ 424,691 | $ 365,369
Interest expense |  |  |  |  |  |  |  |  | 3,878 | 4,715 | 6,815
Depreciation and amortization |  |  |  |  |  |  |  |  | 17,643 | 17,016 | 19,195
Income tax (benefit) expense |  |  |  |  |  |  |  |  | (3,927) | 5,168 | 4,569
Net income (loss) | 8,206 | 3,115 | 7,038 | 5,909 | 4,901 | 4,702 | 5,827 | 5,507 | 24,268 | 20,937 | 6,416
Assets | 265,343 |  |  |  | 259,461 |  |  |  | 265,343 | 259,461 | 248,555
Expenditures for long-lived assets |  |  |  |  |  |  |  |  | 17,089 | 20,329 | 15,249
Metal Bearing Components Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Information |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 252,241 | 308,883 | 271,339
Interest expense |  |  |  |  |  |  |  |  | 387 | 214 | 660
Depreciation and amortization |  |  |  |  |  |  |  |  | 12,060 | 12,295 | 13,522
Income tax (benefit) expense |  |  |  |  |  |  |  |  | 2,819 | 4,785 | 4,687
Net income (loss) |  |  |  |  |  |  |  |  | 20,980 | 30,360 | 24,910
Assets | 198,770 |  |  |  | 188,872 |  |  |  | 198,770 | 188,872 | 190,700
Expenditures for long-lived assets |  |  |  |  |  |  |  |  | 14,875 | 11,791 | 5,450
Precision Metal Components Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Information |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 76,746 | 72,272 | 54,913
Interest expense |  |  |  |  |  |  |  |  | 1,070 | 1,279 | 1,629
Depreciation and amortization |  |  |  |  |  |  |  |  | 4,243 | 3,346 | 4,230
Income tax (benefit) expense |  |  |  |  |  |  |  |  | (1,811) |  |
Net income (loss) |  |  |  |  |  |  |  |  | 8,040 | (3,143) | (8,922)
Assets | 40,727 |  |  |  | 47,027 |  |  |  | 40,727 | 47,027 | 34,839
Expenditures for long-lived assets |  |  |  |  |  |  |  |  | 1,511 | 7,194 | 9,015
Plastic and Rubber Components Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Information |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 41,097 | 43,536 | 39,117
Interest expense |  |  |  |  |  |  |  |  | 960 | 960 | 960
Depreciation and amortization |  |  |  |  |  |  |  |  | 1,366 | 1,371 | 1,439
Income tax (benefit) expense |  |  |  |  |  |  |  |  | (2,244) |  |
Net income (loss) |  |  |  |  |  |  |  |  | 2,961 | 1,919 | 2,504
Assets | 19,232 |  |  |  | 19,740 |  |  |  | 19,232 | 19,740 | 18,871
Expenditures for long-lived assets |  |  |  |  |  |  |  |  | 703 | 1,344 | 784
Corporate and Consolidations [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Information |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | 1,461 | 2,262 | 3,566
Depreciation and amortization |  |  |  |  |  |  |  |  | (26) | 4 | 4
Income tax (benefit) expense |  |  |  |  |  |  |  |  | (2,691) | 383 | (118)
Net income (loss) |  |  |  |  |  |  |  |  | (7,713) | (8,199) | (12,076)
Assets | $ 6,614 |  |  |  | $ 3,822 |  |  |  | $ 6,614 | $ 3,822 | $ 4,145

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