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STOCKHOLDERS' EQUITY - Repurchase of Common Stock (Details) - $ / shares | 6 Months Ended |
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Stockholders' Equity Note [Abstract] |  |  |
Number of shares authorized to be repurchased (in shares) | 3,763,038 |  |
Aggregate number of shares repurchased since inception (in shares) | 2,654,520 |  |
Number of shares remaining in treasury (in shares) | 66,055 |  | 76,084
Number of shares acquired under stock repurchase plan and subsequently reissued (in shares) | 86,124 | 32,505 |
Treasury stock acquired, average cost (in dollars per share) | $ 125.81 | $ 93.05 |

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