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COMMITMENTS, CONTINGENCIES AND OTHER MATTERS - Narrative (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($) officer state | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Loss Contingencies [Line Items] |  |  |
Number of principal shareholders and senior executive officers | officer | 3 |  |
Rental income, due in next fiscal year | $ 2.1 |  |
Rental income, due between one and three years | 4.1 |  |
Rental income, due after year three | 0.2 |  |
Annual rent expense | 12.5 | $ 13.5 | $ 17.7
Related party rent expense | 1.0 | 0.9 | 0.9
Rent expense net of sublease income | $ 0.2 | 0.4 | 0.4
Number of states seeking recovery of unclaimed property | state | 23 |  |
Number of states requesting payments of claimed amounts | state | 21 |  |
Discontinued NATG and ETG |  |  |
Loss Contingencies [Line Items] |  |  |
Annual rent expense | $ 1.1 | $ 2.3 | $ 6.6

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