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