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Consolidated Statements Of Comprehensive Income - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Statement [Abstract]      
Revenues $ 1,165,095 $ 1,142,167 $ 1,059,366
Costs and expenses:      
Cost of revenues 193,326 198,242 192,788
Sales and marketing 81,951 80,250 90,184
Research and development 52,342 59,100 63,718
General and administrative 129,754 118,003 106,730
Total costs and expenses 457,373 455,595 453,420
Operating income 707,722 686,572 605,946
Interest expense (136,336) (115,564) (107,631)
Non-operating income, net 27,626 10,165 (10,665)
Income from continuing operations before income taxes 599,012 581,173 487,650
Income tax (expense) benefit (141,764) (140,528) (112,414)
Net income 457,248 440,645 375,236
Realized foreign currency translation adjustments, included in net income 530 85 (291)
Change in unrealized gain on investments, net of tax 385 533 (519)
Realized gain on investments, net of tax, included in net income (403) (78) (185)
Other comprehensive income (loss) 512 540 (995)
Comprehensive income $ 457,760 $ 441,185 $ 374,241
Earnings per share      
Earnings Per Share, Basic $ 4.56 $ 4.12 $ 3.29
Earnings Per Share, Diluted $ 3.68 $ 3.42 $ 2.82
Shares used to compute net income per share      
Basic 100,325 107,001 114,155
Diluted 124,180 128,833 133,031