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Condensed Consolidated Statements Of 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
Revenues $ 306,289 $ 302,452 $ 612,697 $ 601,740
Costs and expenses:        
Cost of revenues 44,066 47,365 89,570 95,517
Sales and marketing 12,399 16,569 22,918 33,844
Research and development 14,953 13,755 31,085 29,130
General and administrative 33,178 31,753 67,179 64,820
Total costs and expenses 104,596 109,442 210,752 223,311
Operating income 201,693 193,010 401,945 378,429
Interest expense (22,635) (28,792) (45,266) (69,580)
Non-operating income (loss), net 11,436 660 23,639 8,464
Income before income taxes 190,494 164,878 380,318 317,313
Income tax expense (42,960) (36,527) (70,257) (54,699)
Net Income 147,534 128,351 310,061 262,614
Other comprehensive income (loss) 35 17 84 260
Comprehensive Income $ 147,569 $ 128,368 $ 310,145 $ 262,874
Basic income (loss) per share        
Net Income $ 1.24 $ 1.13 $ 2.60 $ 2.49
Diluted income (loss) per share        
Net Income $ 1.24 $ 1.04 $ 2.59 $ 2.13
Shares used to compute net income per share        
Basic 118,965 113,936 119,359 105,639
Diluted 119,361 123,200 119,837 123,399