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EARNINGS PER SHARE - Stock Buyback (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2018 | Dec. 18, 2019 | May 03, 2018 | Sep. 16, 2015
EARNINGS PER SHARE |  |  |  |  |
Authorized amount | $ 38,400 |  |  |  | $ 150,000
Authorized program period repurchase | 30 months |  |  |  |
Authorized amount increase |  |  | $ 25,100 | $ 50,000 |
Amount paid to repurchase shares | $ 11,630 | $ 95,125 |  |  |
Number of shares repurchased | 244 | 1,696 |  |  |
Average repurchase price per share | $ 47.75 | $ 56.07 |  |  |

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