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STOCKHOLDERS' EQUITY - Stock Repurchases (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jun. 21, 2018
Equity [Abstract] |  |  |  |
Repurchases paid (in shares) | 980,000 | 96,000 | 1,078,000 |
Repurchases unsettled (in shares) | 21,000 | 3,000 | 0 |
Stock Repurchase Program, Remaining Authorized Repurchase Amount [Roll Forward] |  |  |  |
Authorization remaining, beginning of period | $ 34,892,000 | $ 39,385,000 | $ 40,534,000 |
Authorizations | 27,003,000 | 0 | 25,879,000 |
Repurchases paid | (54,276,000) | (4,335,000) | (27,028,000) |
Repurchases unsettled | (999,000) | (158,000) | 0 |
Authorization remaining, end of period | $ 6,620,000 | $ 34,892,000 | $ 39,385,000 |
Amount authorized under share repurchase program |  |  |  | $ 50,000,000

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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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