Quarterly report pursuant to Section 13 or 15(d)

Revenue Recognition (Impact of New Revenue Guidance on Statements of Operations) (Details)

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Revenue Recognition (Impact of New Revenue Guidance on Statements of Operations) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Revenue Initial Application Period Cumulative Effect Transition [Line Items]        
Net sales $ 124,832 $ 125,339 $ 372,242 $ 336,958
Cost of sales 89,912 89,284 261,446 238,683
Gross profit 34,920 36,055 110,796 98,275
Selling, general, and administrative expense 16,592 12,914 53,281 44,537
Intangibles amortization 2,868 2,997 8,605 8,532
Income from operations 15,460 20,144 48,910 45,206
Interest expense, net (4,379) (4,860) (12,420) (14,348)
Other expense, net (12) (203) (479) (669)
Income before taxes 11,069 15,081 36,011 31,464
Income tax expense 1,148 5,754 6,802 10,668
Net income $ 9,921 $ 9,327 $ 29,209 $ 20,796
Loss per common share:        
Basic (in dollars per share) $ 0.43 $ 0.41 $ 1.27 $ 0.91
Diluted (in dollars per share) $ 0.43 $ 0.40 $ 1.26 $ 0.90
Accounting Standards Update (“ASU”) No. 2014-09 | Balances without adoption of Topic 606        
Revenue Initial Application Period Cumulative Effect Transition [Line Items]        
Net sales $ 124,816   $ 371,969  
Cost of sales 89,910   261,276  
Gross profit 34,906   110,693  
Income from operations 15,446   48,807  
Income tax expense 1,144   6,774  
Net income 9,911   29,134  
Accounting Standards Update (“ASU”) No. 2014-09 | Effect of Change Higher/(Lower)        
Revenue Initial Application Period Cumulative Effect Transition [Line Items]        
Net sales 16   273  
Cost of sales 2   170  
Gross profit 14   103  
Income from operations 14   103  
Income tax expense 4   28  
Net income $ 10   $ 75  
Loss per common share:        
Basic (in dollars per share) $ 0.43   $ 1.27  
Diluted (in dollars per share) $ 0.43   $ 1.26