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Condensed Consolidated Statements Of Comprehensive Income - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Income Statement [Abstract]    
Revenues $ 281,876 $ 258,422
Costs and expenses:    
Cost of revenues 50,582 48,353
Sales and marketing 20,027 22,382
Research and development 16,743 17,152
General and administrative 27,757 26,298
Total costs and expenses 115,109 114,185
Operating income 166,767 144,237
Interest expense (28,804) (22,017)
Non-operating income (loss), net 3,121 (5,555)
Income before income taxes 141,084 116,665
Income tax expense (33,628) (28,427)
Net Income 107,456 88,238
Change in unrealized gain on investments, net of tax 935 87
Realized gain on investments, net of tax, included in net income (66) (4)
Other comprehensive income (loss) 869 83
Comprehensive Income $ 108,325 $ 88,321
Basic income (loss) per share    
Net Income $ 0.98 $ 0.75
Diluted income (loss) per share    
Net Income $ 0.82 $ 0.66
Shares used to compute net income per share    
Basic 109,592 117,139
Diluted 131,581 133,850