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Condensed Consolidated Statements Of Comprehensive Income - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Revenues $ 308,421 $ 305,777 $ 921,118 $ 907,517
Costs and expenses:        
Cost of revenues 44,443 48,249 134,013 143,766
Sales and marketing 9,857 13,868 32,775 47,712
Research and development 14,619 13,712 45,704 42,842
General and administrative 33,886 34,951 101,065 99,771
Total costs and expenses 102,805 110,780 313,557 334,091
Operating income 205,616 194,997 607,561 573,426
Interest expense (22,633) (22,631) (67,899) (92,211)
Non-operating income (loss), net 10,498 5,935 34,137 14,399
Income before income taxes 193,481 178,301 573,799 495,614
Income tax expense (39,568) (40,621) (109,825) (95,320)
Net Income 153,913 137,680 463,974 400,294
Other comprehensive income (loss) 308 (322) 392 (62)
Comprehensive Income $ 154,221 $ 137,358 $ 464,366 $ 400,232
Basic income (loss) per share        
Net Income $ 1.30 $ 1.13 $ 3.90 $ 3.60
Diluted income (loss) per share        
Net Income $ 1.30 $ 1.13 $ 3.89 $ 3.25
Shares used to compute net income per share        
Basic 118,194 121,682 118,966 111,046
Diluted 118,569 122,261 119,410 123,079