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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Revenue Initial Application Period Cumulative Effect Transition [Line Items]        
Net sales $ 163,446 $ 139,371 $ 247,410 $ 211,619
Cost of sales 107,597 94,338 171,534 149,399
Gross profit 55,849 45,033 75,876 62,220
Selling, general, and administrative expense 20,543 16,746 36,689 31,623
Intangibles amortization 2,866 2,786 5,737 5,535
Income from operations 32,440 25,501 33,450 25,062
Interest expense, net (4,096) (4,192) (8,041) (9,488)
Other expense, net (264) (230) (467) (466)
Income before taxes 28,080 22,354 24,942 16,383
Income tax expense 6,916 7,608 5,654 4,914
Net income $ 21,164 $ 14,746 $ 19,288 $ 11,469
Loss per common share:        
Basic (in dollars per share) $ 0.92 $ 0.64 $ 0.84 $ 0.50
Diluted (in dollars per share) $ 0.91 $ 0.64 $ 0.83 $ 0.50
Accounting Standards Update (“ASU”) No. 2014-09 | Balances without adoption of Topic 606        
Revenue Initial Application Period Cumulative Effect Transition [Line Items]        
Net sales $ 163,483   $ 247,153  
Cost of sales 107,618   171,366  
Gross profit 55,865   75,787  
Selling, general, and administrative expense 20,543   36,689  
Intangibles amortization 2,866   5,737  
Income from operations 32,456   33,361  
Interest expense, net (4,096)   (8,041)  
Other expense, net (264)   (467)  
Income before taxes 28,096   24,853  
Income tax expense 6,920   5,630  
Net income 21,176   19,223  
Accounting Standards Update (“ASU”) No. 2014-09 | Effect of Change Higher/(Lower)        
Revenue Initial Application Period Cumulative Effect Transition [Line Items]        
Net sales (37)   257  
Cost of sales (21)   168  
Gross profit (16)   89  
Income from operations (16)   89  
Income before taxes (16)   89  
Income tax expense (4)   24  
Net income $ (12)   $ 65  
Loss per common share:        
Basic (in dollars per share) $ 0.92   $ 0.84  
Diluted (in dollars per share) $ 0.91   $ 0.83