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DISCONTINUED OPERATIONS - Schedule of financial information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Revenue | $ 0 | $ 0 | $ 0
Other operating expenses | (33,308) | (35,002) | (16,228)
Loss before income taxes | (33,308) | (30,487) | (16,228)
Income tax benefit | 7,619 | 8,855 | 3,408
Loss from discontinued operations, net of tax | (25,689) | (21,632) | (12,820)
Home Loan Center, Inc. | Disposed of by means other than sale |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Gain on disposal | $ 0 | $ 4,515 | $ 0

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