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Condensed Consolidated Statements Of Comprehensive Income - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Revenues $ 302,452 $ 288,552 $ 601,740 $ 577,166
Costs and expenses:        
Cost of revenues 47,365 47,644 95,517 98,313
Sales and marketing 16,569 19,474 33,844 37,796
Research and development 13,755 13,510 29,130 26,854
General and administrative 31,753 32,964 64,820 63,972
Total costs and expenses 109,442 113,592 223,311 226,935
Operating income 193,010 174,960 378,429 350,231
Interest expense (28,792) (29,090) (69,580) (58,113)
Non-operating income (loss), net 660 14,002 8,464 15,303
Income before income taxes 164,878 159,872 317,313 307,421
Income tax expense (36,527) (36,772) (54,699) (67,909)
Net Income 128,351 123,100 262,614 239,512
Other comprehensive income (loss) 17 217 260 563
Comprehensive Income $ 128,368 $ 123,317 $ 262,874 $ 240,075
Basic income (loss) per share        
Net Income $ 1.13 $ 1.22 $ 2.49 $ 2.35
Diluted income (loss) per share        
Net Income $ 1.04 $ 0.99 $ 2.13 $ 1.93
Shares used to compute net income per share        
Basic 113,936 101,060 105,639 101,759
Diluted 123,200 123,980 123,399 124,218