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SHAREHOLDERS' EQUITY - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jul. 25, 2019 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2019 | Dec. 31, 2018
Class of Stock [Line Items] |  |  |  |  |  |  |
Number of shares repurchased and retired (shares) |  | 513,116 | 1,603,248 | 1,808,398 | 1,612,174 |  |
Cost of shares repurchased, including commissions |  | $ 71,999 | $ 179,917 | $ 229,995 | $ 180,897 |  |
Average cost per share (USD per share) |  | $ 140.32 | $ 112.20 | $ 127.18 | $ 112.19 |  |
Dividends declared (USD per share) |  |  |  | $ 0.01 |  |  |
Common stock authorized (shares) |  | 200,000,000 |  | 200,000,000 |  |  | 200,000,000
Forecast |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Common stock authorized (shares) |  |  |  |  |  | 400,000,000 |
Subsequent Event |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Dividends declared (USD per share) | $ 0.01 |  |  |  |  |  |
Other than accelerated share repurchase program |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Remaining authorized repurchase amount (up to) |  | $ 566,000 |  | $ 566,000 |  |  |

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