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STOCKHOLDERS' EQUITY (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Preferred stock |  |  |  |
Preferred stock authorized for issuance (in shares) |  | 2,000,000 | 2,000,000 |
Preferred stock, par value (in dollars per share) |  | $ 0.01 | $ 0.01 |
Common stock |  |  |  |
Common stock authorized for issuance (in shares) |  | 60,000,000 | 60,000,000 |
Common stock par value (in dollars per share) |  | $ 0.01 | $ 0.01 |
Equity offering |  |  |  |
Equity offering in period, new shares (in shares) | 3,300,000 |  |  |
New shares issued, price per share (in dollars per share) | $ 260 |  |  |
Proceeds from equity offering, net of transaction costs | $ 834,000 | $ 0 | $ 0 | $ 833,911
Payments for underwriting expense | $ 29,000 |  |  |

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