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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Reclassifications (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2016
Prior period corrections |  |
Reclassification, decrease (increase) to expense | $ (0.8) |
Termination and access fees |  |
Prior period corrections |  |
Reclassification, decrease (increase) to expense |  | $ 4.9
Engineering and operations expenses |  |
Prior period corrections |  |
Reclassification, decrease (increase) to expense |  | (7.5)
Equipment expense |  |
Prior period corrections |  |
Reclassification, decrease (increase) to expense |  | (0.6)
Selling and marketing expense. |  |
Prior period corrections |  |
Reclassification, decrease (increase) to expense |  | 0.8
General and administrative expense |  |
Prior period corrections |  |
Reclassification, decrease (increase) to expense |  | $ 2.4

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