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EQUITY - Share Repurchase Program (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended | 132 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2021 | Feb. 28, 2021 | Dec. 31, 2018 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Share Repurchase Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized amount |  |  | $ 250,000 |  |  |  | $ 250,000 |  |  |  | $ 1,600,000 | $ 250,000 | $ 250,000 | $ 1,600,000 | $ 200,000 | $ 250,000 | $ 100,000 | $ 100,000 | $ 100,000 | $ 100,000 | $ 100,000 | $ 100,000
Number of shares of common stock repurchased | 331,373 | 490,632 | 1,013,709 | 465,366 | 992,159 | 1,062,881 | 600,442 | 453,319 | 100 | 366,793 | 822,005 | 3,534,115 | 1,420,654 | 18,072,129 |  |  |  |  |  |  |  |
Average price paid per share | $ 101.57 | $ 96.97 | $ 86.79 | $ 89.92 | $ 100.54 | $ 112.46 | $ 115.76 | $ 115.49 | $ 104.75 | $ 95.36 | $ 98.82 |  |  | $ 68.12 |  |  |  |  |  |  |  |
Total purchase price | $ 33,700 | $ 47,600 | $ 88,000 | $ 41,800 | $ 99,800 | $ 119,500 | $ 69,500 | $ 52,400 | $ 10 | $ 35,000 | $ 81,300 | $ 349,100 | $ 156,900 | $ 1,200,000 |  |  |  |  |  |  |  |

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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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