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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Income Statement [Abstract]        
Total revenue, net $ 383,645 $ 366,190 $ 743,335 $ 723,272
Costs and expenses:        
Cost of goods sold 143,671 137,565 272,583 281,787
Research and development 17,633 19,108 35,954 37,433
Selling, general and administrative 165,378 176,597 340,247 340,163
Intangible asset amortization 11,004 5,286 16,284 10,676
Total costs and expenses 337,686 338,556 665,068 670,059
Operating income 45,959 27,634 78,267 53,213
Interest income 2,710 174 5,138 250
Interest expense (13,384) (17,504) (26,533) (36,272)
Other income, net 1,098 2,427 4,334 4,672
Income before income taxes 36,383 12,731 61,206 21,863
Income tax expense (benefit) 6,647 1,355 (1,286) (505)
Net income $ 29,736 $ 11,376 $ 62,492 $ 22,368
Net income per share        
Basic (in dollars per share) $ 0.35 $ 0.14 $ 0.73 $ 0.28
Diluted (in dollars per share) $ 0.34 $ 0.14 $ 0.72 $ 0.27
Weighted average common shares outstanding (See Note 13):        
Basic (in shares) 85,577 82,423 85,460 80,491
Diluted (in shares) 86,257 83,513 86,407 81,702
Comprehensive income (See Note 14) $ 17,714 $ (12,269) $ 39,235 $ 21,401