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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Reclassifications (Details) $ in Millions	12 Months Ended
	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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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