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Selected Quarterly Financial Data (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]                      
Deferred Tax Benefit Expense Valuation Allowance Adj Capital Loss Carryforwards                 $ 0    
Sales $ 245,836 $ 247,121 $ 247,347 $ 221,026 $ 204,772 $ 207,702 $ 208,533 $ 207,333 961,330 $ 828,341 $ 896,177
Gross profit 36,979 42,107 42,063 30,872 27,801 33,927 31,637 37,279      
Net income (loss) $ (17,929) $ 8,274 $ 44,204 $ 3,703 $ 1,728 $ 12,048 $ 3,408 $ 7,281 $ 38,251 $ 24,466 $ (32,135)
Basic:                      
Basic $ (0.54) $ 0.25 $ 1.34 $ 0.11 $ 0.05 $ 0.37 $ 0.10 $ 0.22 $ 1.16 $ 0.75 $ (0.99)
Diluted:                      
Net income (in usd per share) $ (0.54) $ 0.25 $ 1.34 $ 0.11 $ 0.05 $ 0.37 $ 0.10 $ 0.22 $ 1.16 $ 0.75 $ (0.99)
Shares used to compute earnings (loss) per share:                      
Shares used to compute earnings (loss) per share, Basic (in shares) 32,948,000 32,954,000 32,961,000 32,920,000 32,856,000 32,818,000 32,716,000 32,654,000 32,945,961 32,761,793 32,578,116
Shares used to compute earnings (loss) per share, Diluted (in shares) 32,948,000 32,954,000 33,051,000 32,957,000 32,900,000 32,818,000 32,716,000 32,654,000 32,951,288 32,775,072 32,578,116