DERIVATIVE INSTRUMENTS (Tables)

3 Months Ended

Mar. 31, 2017

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Other Derivatives Not Designated as Hedging Instruments, Statements of Financial Performance and Financial Position, Location

The fair value of outstanding derivative instruments not designated as hedging instruments on the accompanying unaudited Consolidated Balance Sheets was as follows (in thousands):

Derivative Instruments	Balance Sheet Location	March 31, 2017		December 31, 2016
Contracts to purchase power	Other current liabilities	$	13,954	$	13,382
Contracts to purchase power	Other liabilities	19,028		18,384
Contract to sell power	Other current assets	9,789		10,240
Contract to sell power	Other assets	13,519		9,528

The effect of derivative instruments not designated as hedging instruments on the accompanying unaudited Consolidated Statements of Operations was as follows (in thousands):

		Three Months Ended March 31,
Derivative Instruments	Statements of Operations Location	2017			2016
Contracts to purchase power	Derivative (gain) loss	$	1,216		$	2,600
Contract to sell power	Derivative (gain) loss	(3,600		)	—
		$	(2,384	)	$	2,600