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STOCKHOLDERS' EQUITY (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 8 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 09, 2020 | Jul. 10, 2019 | Sep. 30, 2021 | Jun. 30, 2021 | Jun. 30, 2020 | Mar. 20, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | May 04, 2021 | Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized |  |  | 500,000 |  |  |  | 500,000 |  |  | 500,000
Shares issued and sold |  |  |  |  | 17,250 |  |  |  |  |
Stock repurchase program, expiration date |  | Jun. 30, 2021 |  |  |  |  |  |  |  |
Stock repurchase program, remaining authorized repurchase amount |  |  |  |  |  | $ 20,000 |  |  |  |
Stock repurchase program, number of shares repurchased |  |  | 2,300,000 | 1,100,000 |  | 3,700,000 |  |  |  |
Stock repurchase program, average cost per share |  |  |  |  |  | $ 35.48 |  |  |  |
Stock repurchase program, shares repurchased amount |  |  | $ 82,700 | $ 42,300 |  |  |  |  |  |
Preferred stock, shares outstanding |  |  | 17,250 |  |  |  | 17,250 |  |  | 17,250
Net proceeds from issuance of preferred stock |  |  |  |  |  |  | $ 0 | $ 166,356 |  |
Maximum |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  | $ 150,000 |  |  |  |  |  |  | $ 125,000 |
Depositary Shares |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |
Shares issued and sold | 6,900,000 |  |  |  |  |  |  |  |  |
Number of shares to be purchased upon the exercise of options | 900,000 |  |  |  |  |  |  |  |  |
Preferred stock, liquidation preference (usd per share) | $ 25 |  |  |  |  |  |  |  |  |
Series A Preferred Stock |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |
Number of preferred stock represented by each depositary share |  |  |  |  |  |  | The Series A preferred stock is represented by depositary shares, each representing a 1/400th ownership interest in a share of Series A preferred stock |  |  |
Preferred stock, liquidation preference (usd per share) | $ 10,000 |  |  |  |  |  |  |  |  |
Net proceeds from issuance of preferred stock | $ 166,400 |  |  |  |  |  |  |  |  |

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