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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

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- Definition The aggregate cost of goods produced and sold and services rendered during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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