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Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Statement [Abstract]      
Revenues $ 331,378 $ 301,853 $ 293,461
Cost of goods sold 169,243 164,073 157,939
Gross profit 162,135 137,780 135,522
Operating expenses      
Sales and marketing 42,315 36,542 34,740
General and administrative 49,842 38,832 43,894
Research and development 18,125 12,203 14,358
Total operating expenses 110,282 87,577 92,992
Gain on sales of assets 0 6,385 0
Operating income 51,853 56,588 42,530
Interest expense 18,410 26,618 38,715
Debt retirement costs 0 1,896 0
Loss on extinguishment of debt 2,442 0 15,528
Other (income) expense (8,638) (220) 65
Income (loss) before income taxes 39,639 28,294 (11,778)
Income tax (benefit) provision (83,746) 1,532 2,968
Net income (loss) $ 123,385 $ 26,762 $ (14,746)
Net income (loss) per common share:      
Basic (in dollars per share) $ 3.31 $ 0.84 $ (0.60)
Diluted (in dollars per share) $ 3.17 $ 0.82 $ (0.60)
Weighted-average common shares outstanding:      
Basic (in shares) 37,276 32,044 24,440
Diluted (in shares) 38,892 32,656 24,440