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STOCKHOLDERS' EQUITY - Repurchase of Common Stock (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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) | 2,568,396 |  |
Treasury stock (in shares) | 76,084 | 203,879 |
Number of shares acquired under the stock repurchase plan and subsequently reissued (in shares) | 136,629 | 240,995 | 16,755
Treasury stock acquired, average cost (in dollars per share) | $ 98.54 | $ 88.47 | $ 83.08

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- Definition Cumulative number of shares repurchased under the repurchase program since the inception of the program as of balance sheet date. + References No definition available. + Details
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- Definition Number of shares that have been repurchased and reissued during the period. + References No definition available. + Details
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- Definition The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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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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- Definition Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29,30) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: 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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