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EARNINGS PER SHARE - Share Repurchase (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Mar. 31, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Jul. 29, 2021
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Amount paid to repurchase shares | $ 6,503 | $ 7,248 | $ 6,503 | $ 7,248 |
Number of shares repurchased | 72,000 |  | 72,000 | 170,000 |
Average repurchase price per share | $ 90.34 |  | $ 90.34 | $ 42.59 |
Remaining authorized by Board of Directors for future repurchases as of period end | $ 31,866 |  | $ 31,866 | $ 42,751 |
Shares repurchased from related parties |  |  | 0 |  |
Subsequent Event [Member] |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Stock repurchase plan authorized amount |  |  |  |  | $ 200,000

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