ACQUISITIONS (Details) - NGR Acquisition [Member] - USD ($) $ in Millions	1 Months Ended	3 Months Ended	12 Months Ended
	Feb. 27, 2015	Mar. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Payments to acquire interest in affiliate	$ 85.0
Price transferred to escrow agent	20.0
Amount released from escrow and paid to seller		$ 11.0
Earnout period (in years)		5 years
Maximum contingent consideration	17.0	$ 17.0
Accretion of contingent consideration			$ 0.3
Other assets, net		6.0
Returned escrow deposit released		3.0
Business Combination, Gain Recognized, Escrow Funds		3.0
Business Combination, Gain Recognized, Reversal of Liability		$ 2.6
Contingent liability reversed	$ 2.3