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Selected Quarterly Financial Data (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]                      
Deferred Tax Benefit Expense Valuation Allowance Adj Capital Loss Carryforwards                 $ 0 $ 1,000 $ 5,000
Sales $ 204,772 $ 207,702 $ 208,533 $ 207,333 $ 216,989 $ 223,772 $ 221,245 $ 234,171 828,341 896,177 951,826
Gross profit 27,801 33,927 31,637 37,279 40,249 33,468 29,748 37,415      
Income (loss) from continuing operations                 24,466 (32,135) 36,029
Income (loss) from discontinued operations [1]                 0 0 850
Net income (loss) $ 1,728 $ 12,048 $ 3,408 $ 7,281 $ (5,876) $ (36,723) $ 594 $ 9,870 $ 24,466 $ (32,135) $ 36,879
Basic:                      
Continuing operations                 $ 0.75 $ (0.99) $ 1.12
Discontinued operations                 0.00 0.00 0.02
Basic $ 0.05 $ 0.37 $ 0.10 $ 0.22 $ (0.18) $ (1.13) $ 0.02 $ 0.30 0.75 (0.99) 1.14
Diluted:                      
Continuing operations (in usd per share)                 0.75 (0.99) 1.11
Discontinued operations (in usd per share)                 0.00 0.00 0.02
Net income (in usd per share) $ 0.05 $ 0.37 $ 0.10 $ 0.22 $ (0.18) $ (1.13) $ 0.02 $ 0.30 $ 0.75 $ (0.99) $ 1.13
Shares used to compute earnings per share:                      
Shares used to compute earnings (loss) per share, Basic (in shares) 32,856,000 32,818,000 32,716,000 32,654,000 32,614,000 32,605,000 32,609,000 32,482,000 32,761,793 32,578,116 32,302,108
Shares used to compute earnings (loss) per share, Diluted (in shares) 32,900,000 32,828,000 32,716,000 32,654,000 32,614,000 32,605,000 32,746,000 32,628,000 32,775,072 32,578,116 32,553,854
Deferred Tax Benefit Expense Unremitted Earnings FCTA                 $ 500 $ 2,200  
[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.