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Condensed Consolidated Statements Of Comprehensive Income - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Revenues $ 288,552 $ 286,466 $ 577,166 $ 568,342
Costs and expenses:        
Cost of revenues 47,644 48,753 98,313 99,335
Sales and marketing 19,474 19,757 37,796 39,784
Research and development 13,510 14,288 26,854 31,031
General and administrative 32,964 27,401 63,972 55,158
Total costs and expenses 113,592 110,199 226,935 225,308
Operating income 174,960 176,267 350,231 343,034
Interest expense (29,090) (28,859) (58,113) (57,663)
Non-operating income (loss), net 14,002 1,709 15,303 4,830
Income before income taxes 159,872 149,117 307,421 290,201
Income tax expense (36,772) (35,907) (67,909) (69,535)
Net Income 123,100 113,210 239,512 220,666
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, before Tax 0 85 0 85
Change in unrealized gain on investments, net of tax 313 851 678 1,786
Realized gain on investments, net of tax, included in net income (96) (1) (115) (67)
Other comprehensive income (loss) 217 935 563 1,804
Comprehensive Income $ 123,317 $ 114,145 $ 240,075 $ 222,470
Basic income (loss) per share        
Net Income $ 1.22 $ 1.05 $ 2.35 $ 2.03
Diluted income (loss) per share        
Net Income $ 0.99 $ 0.87 $ 1.93 $ 1.68
Shares used to compute net income per share        
Basic 101,060 108,067 101,759 108,829
Diluted 123,980 130,588 124,218 131,084