BASIS OF PRESENTATION - Reclassifications (Details) $ in Millions	3 Months Ended
	Mar. 31, 2015 USD ($)
Termination and Access Fees [Member]
Prior period corrections
Reclassification, decrease (increase) to expense	$ 2.4
Engineering and Operations Expenses [Member]
Prior period corrections
Reclassification, decrease (increase) to expense	(1.0)
General and administrative expense
Prior period corrections
Reclassification, decrease (increase) to expense	$ (1.4)