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Segment Reporting Segment Reporting (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
Segment
Dec. 31, 2011
Dec. 31, 2010
Segment Reporting Information [Line Items]                      
Number of Operating Segments                 2    
Net sales                      
Consolidated total $ 68,193 $ 71,984 $ 74,348 $ 75,962 $ 72,860 $ 75,366 $ 84,154 $ 82,579 $ 290,487 $ 314,959 $ 316,780
Operating income (expense)                      
Severance expenses     (6,800)           (8,021) (1,614) (3,629)
Gain (loss) on sale of assets                 3,721 (22) 1,701
Goodwill impairment     (28,300)           (28,306) 0 0
Other operating income (expense)                 0 (2,346) 4,050
Operating income (expense)                 (43,149) (5,496) 16,927
Interest expense                 (775) (681) (391)
Other income (expense), net                 (56) 101 160
Income (loss) from continuing operations before income taxes                 (43,980) (6,076) 16,696
Capital expenditures                 18,501 11,132 10,048
Depreciation and amortization                 7,134 5,704 6,306
Total assets 172,931       222,748       172,931 222,748 236,384
MRO [Member]
                      
Net sales                      
Consolidated total                 273,562 300,399 303,138
Operating income (expense)                      
Operating income (expense)                 (12,461) (2,466) 14,522
Capital expenditures                 18,127 11,066 10,038
Depreciation and amortization                 7,085 5,342 5,900
Total assets 162,011       194,422       162,011 194,422 210,273
OEM [Member]
                      
Net sales                      
Consolidated total                 16,925 14,560 13,642
Operating income (expense)                      
Operating income (expense)                 1,918 952 283
Capital expenditures                 374 66 10
Depreciation and amortization                 49 362 406
Total assets 10,498       10,336       10,498 10,336 9,749
Segment Net [Member]
                      
Operating income (expense)                      
Total assets 172,509       204,758       172,509 204,758 220,022
Corporate [Member]
                      
Operating income (expense)                      
Total assets 72       17,580       72 17,580 15,743
Discontinued Operations [Member]
                      
Operating income (expense)                      
Total assets $ 350       $ 410       $ 350 $ 410 $ 619