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Business Acquisitions - Supplementary Information on Unaudited Pro Forma Financial Basis (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
RetailMeNot, Inc. |  |  |  |
Revenues | $ 1,639,495 | $ 1,589,437 |  |
Net income | $ 140,880 | $ 190,709 |  |
EPS - Basic (in usd per share) | $ 3.03 | $ 3.94 |  |
EPS - Diluted (in usd per share) | $ 2.98 | $ 3.83 |  |
Fiscal 2020 Acquisitions |  |  |  |
Revenues | $ 1,671,955 | $ 1,633,861 |  |
Net income | $ 140,534 | $ 178,654 |  |
EPS - Basic (in usd per share) | $ 3.02 | $ 3.69 |  |
EPS - Diluted (in usd per share) | $ 2.97 | $ 3.59 |  |
Fiscal 2019 Acquisitions |  |  |  |
Revenues |  | $ 1,474,132 | $ 1,427,914 |
Net income |  | $ 211,303 | $ 104,710 |
EPS - Basic (in usd per share) |  | $ 4.36 | $ 2.15 |
EPS - Diluted (in usd per share) |  | $ 4.24 | $ 2.11 |
Fiscal 2018 Acquisitions |  |  |  |
Revenues |  |  | $ 1,264,544 | $ 1,218,530
Net income |  |  | $ 121,727 | $ 123,378
EPS - Basic (in usd per share) |  |  | $ 2.50 | $ 2.56
EPS - Diluted (in usd per share) |  |  | $ 2.45 | $ 2.50

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- Definition The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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