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REVENUE RECOGNITION - Contract Acquisition Costs (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 USD ($) | Jun. 30, 2019 USD ($)
Contract Acquisition Costs |  |
Amortization of contract acquisition cost | $ 0.4 | $ 0.9
Prepayments and other current assets |  |
Contract Acquisition Costs |  |
Short-term contract acquisition costs | 1.1 | 1.1
Other assets |  |
Contract Acquisition Costs |  |
Long-term contract acquisition costs | $ 1.4 | $ 1.4

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