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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Reclassifications (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2016 USD ($)
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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