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Selected Quarterly Financial Data (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]                      
Deferred Tax Benefit Expense Valuation Allowance Adj Capital Loss Carryforwards         $ 4,800       $ 1,000 $ 4,900  
Sales $ 216,989 $ 223,772 $ 221,245 $ 234,171 239,219 $ 240,429 $ 236,965 $ 235,213 896,177 951,826 $ 959,346
Gross profit 40,249 33,468 29,748 37,415 34,109 34,582 38,480 37,749      
Income (loss) from continuing operations (5,876) (36,723) 594 9,870 13,054 10,745 3,752 8,479 (32,135) 36,029 35,937
Income (loss) from discontinued operations 0 0 0 0 0 850 0 0 0 [1] 850 [1] (13,990) [1]
Net income (loss) $ (5,876) $ (36,723) $ 594 $ 9,870 $ 13,054 $ 11,595 $ 3,752 $ 8,479 $ (32,135) $ 36,879 $ 21,947
Basic:                      
Continuing operations $ (0.18) $ (1.13) $ 0.02 $ 0.30 $ 0.40 $ 0.33 $ 0.12 $ 0.26 $ (0.99) $ 1.12 $ 1.12
Discontinued operations 0.00 0.00   0.00 0.00 0.03 0.00   0.00 0.02 (0.44)
Net income (0.18) (1.13) 0.02 0.30 0.40 0.36 0.12 0.26 (0.99) 1.14 0.68
Diluted:                      
Continuing operations (in usd per share) (0.18) (1.13) 0.02 0.30 0.40 0.33 0.11 0.26 (0.99) 1.11 1.10
Discontinued operations (in usd per share) 0.00 0.00   0.00 0.00 0.03 0.00   0.00 0.02 (0.43)
Net income (in usd per share) $ (0.18) $ (1.13) $ 0.02 $ 0.30 $ 0.40 $ 0.36 $ 0.11 $ 0.26 $ (0.99) $ 1.13 $ 0.67
Shares used to compute earnings (loss) per share:                      
Shares used to compute earnings (loss) per share, Basic (in shares) 32,614,000 32,605,000 32,609,000 32,482,000 32,335,000 32,319,000 32,312,000 32,242,000 32,578,116 32,302,108 32,171,751
Shares used to compute earnings (loss) per share, Diluted (in shares) 32,614,000 32,605,000 32,746,000 32,628,000 32,449,000 32,507,000 32,641,000 32,621,000 32,578,116 32,553,854 32,599,279
Deferred Tax Benefit Expense Unremitted Earnings FCTA                 $ 500 $ 2,200 $ 1,700
[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.