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Condensed Consolidated Statements Of Comprehensive Income - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Revenues $ 288,614 $ 281,876
Costs and expenses:    
Cost of revenues 50,669 50,582
Sales and marketing 18,322 20,027
Research and development 13,344 16,743
General and administrative 31,008 27,757
Total costs and expenses 113,343 115,109
Operating income 175,271 166,767
Interest expense (29,023) (28,804)
Non-operating income (loss), net 1,301 3,121
Income before income taxes 147,549 141,084
Income tax expense (31,137) (33,628)
Net Income 116,412 107,456
Change in unrealized gain on investments, net of tax 365 935
Realized gain on investments, net of tax, included in net income (19) (66)
Other comprehensive income (loss) 346 869
Comprehensive Income $ 116,758 $ 108,325
Basic income (loss) per share    
Net Income $ 1.14 $ 0.98
Diluted income (loss) per share    
Net Income $ 0.94 $ 0.82
Shares used to compute net income per share    
Basic 102,467 109,592
Diluted 124,464 131,581