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COMMON STOCK REPURCHASE PROGRAM (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Feb. 12, 2020
COMMON STOCK REPURCHASE PROGRAM |  |  |  |
Shares authorized for repurchase under share repurchase program (in shares) |  | 55,000,000 |  | 10,000,000
Shares purchased in the open market under share repurchase program (in shares) | 1,400,000 |  |  |
Value of common shares repurchased | $ 113,455 | $ 292,693 | $ 201,650 |
Average cost per share of shares purchased in the open market under share repurchase program (in dollars per share) | $ 80.22 |  |  |
Remaining shares available for repurchase under the stock repurchase program (in shares) | 11,500,000 |  |  |

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