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Condensed Consolidated Statements Of Comprehensive Income - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Revenues $ 323,621 $ 312,524
Costs and expenses:    
Cost of revenues 46,968 45,573
Sales and marketing 8,484 6,604
Research and development 20,311 17,358
General and administrative 37,451 36,725
Total costs and expenses 113,214 106,260
Operating income 210,407 206,264
Interest expense (22,534) (22,535)
Non-operating income (loss), net 444 7,084
Income before income taxes 188,317 190,813
Income tax expense (37,963) 143,303
Net Income 150,354 334,116
Other comprehensive income (loss) 9 2,263
Comprehensive Income $ 150,363 $ 336,379
Basic income (loss) per share    
Net Income $ 1.33 $ 2.87
Diluted income (loss) per share    
Net Income $ 1.33 $ 2.86
Shares used to compute net income per share    
Basic 113,131 116,375
Diluted 113,296 116,730