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Selected Quarterly Financial Data (Details) (USD $)
In Thousands, except Share data, 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
Selected Quarterly Financial Data [Abstract]                      
Sales $ 233,038 $ 216,648 $ 215,859 $ 216,643 $ 201,042 $ 201,184 $ 200,674 $ 191,520 $ 882,188 $ 794,420 $ 738,200
Gross Profit 37,710 38,087 33,435 35,450 31,214 32,108 28,858 29,665      
Income from continuing operations 13,850 14,210 7,388 7,737 3,481 12,241 6,027 6,796 43,185 28,545 26,841
Income (loss) from discontinued operations (3,377) (6,783) (35) (4,739) (3,733) 495 (324) (128) (14,934) [1] (3,690) [1] 186 [1]
Net income (loss) $ 10,473 $ 7,427 $ 7,353 $ 2,998 $ (252) $ 12,736 $ 5,703 $ 6,668 $ 28,251 $ 24,855 $ 27,027
Basic, Continuing operations $ 0.43 $ 0.44 $ 0.23 $ 0.24 $ 0.11 $ 0.38 $ 0.19 $ 0.21 $ 1.35 $ 0.89 $ 0.83
Basic, Discontinued operations $ (0.10) $ (0.21)   $ (0.15) $ (0.12) $ 0.02 $ (0.01)   $ (0.47) $ (0.12) $ 0.01
Basic, Net income (loss) $ 0.33 $ 0.23 $ 0.23 $ 0.09 $ (0.01) $ 0.40 $ 0.18 $ 0.21 $ 0.88 $ 0.77 $ 0.84
Diluted, Continuing operations $ 0.43 $ 0.44 $ 0.23 $ 0.24 $ 0.11 $ 0.38 $ 0.19 $ 0.21 $ 1.34 $ 0.89 $ 0.82
Diluted, Discontinued operations $ (0.10) $ (0.21)   $ (0.15) $ (0.12) $ 0.02 $ (0.01)   $ (0.46) $ (0.12) $ 0.01
Diluted, Net income (loss) $ 0.33 $ 0.23 $ 0.23 $ 0.09 $ (0.01) $ 0.40 $ 0.18 $ 0.21 $ 0.88 $ 0.77 $ 0.83
Shares used to compute earnings (loss) per share, Basic 32,016,000 32,052,000 32,051,000 32,010,000 31,975,000 31,952,000 31,946,000 31,854,000 32,032,343 31,931,962 32,291,556
Shares used to compute earnings (loss) per share, Diluted 32,176,000 32,101,000 32,101,000 32,393,000 32,328,000 32,060,000 32,205,000 32,262,000 32,192,576 32,213,174 32,572,121
[1] See Notes 1, 3, 4 and 18 for more information on losses associated with plant shutdowns, asset impairments and restructurings, unusual items, gains or losses from sale of assets, gains or losses on an investment accounted for under the fair value method and other items.