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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, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract]                      
Sales $ 231,096 $ 243,194 $ 243,530 $ 241,526 $ 233,038 $ 216,648 $ 215,859 $ 216,644 $ 959,346 $ 882,188 $ 794,420
Gross profit 34,417 37,253 37,540 36,836 37,710 38,087 33,435 35,450      
Income from continuing operations 9,402 7,428 9,590 9,517 13,850 14,210 7,388 7,737 35,937 43,185 28,545
Income (loss) from discontinued operations 0 (450) (8,300) (5,240) (3,377) (6,783) (35) (4,739) (13,990) [1] (14,934) [1] (3,690) [1]
Net income (loss) $ 9,402 $ 6,978 $ 1,290 $ 4,277 $ 10,473 $ 7,427 $ 7,353 $ 2,998 $ 21,947 $ 28,251 $ 24,855
Basic:                      
Continuing operations $ 0.29 $ 0.23 $ 0.30 $ 0.30 $ 0.43 $ 0.44 $ 0.23 $ 0.24 $ 1.12 $ 1.35 $ 0.89
Discontinued operations $ 0.00 $ (0.01) $ (0.26) $ (0.16) $ (0.10) $ (0.21) $ 0.00 $ (0.15) $ (0.44) $ (0.47) $ (0.12)
Net income $ 0.29 $ 0.22 $ 0.04 $ 0.14 $ 0.33 $ 0.23 $ 0.23 $ 0.09 $ 0.68 $ 0.88 $ 0.77
Diluted:                      
Continuing operations (in usd per share) $ 0.29 $ 0.23 $ 0.29 $ 0.29 $ 0.43 $ 0.44 $ 0.23 $ 0.24 $ 1.10 $ 1.34 $ 0.89
Discontinued operations (in usd per share) $ 0.00 $ (0.02) $ (0.25) $ (0.16) $ (0.10) $ (0.21) $ 0.00 $ (0.15) $ (0.43) $ (0.46) $ (0.12)
Net income (in usd per share) $ 0.29 $ 0.21 $ 0.04 $ 0.13 $ 0.33 $ 0.23 $ 0.23 $ 0.09 $ 0.67 $ 0.88 $ 0.77
Shares used to compute earnings (loss) per share:                      
Shares used to compute earnings (loss) per share, Basic (in shares) 32,222,000 32,201,000 32,187,000 32,076,000 32,016,000 32,052,000 32,051,000 32,010,000 32,171,751 32,032,343 31,931,962
Shares used to compute earnings (loss) per share, Diluted (in shares) 32,622,000 32,658,000 32,635,000 32,480,000 32,176,000 32,101,000 32,101,000 32,393,000 32,599,279 32,192,576 32,213,174
[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.