FAIR VALUE MEASUREMENTS (Tables)

3 Months Ended

Mar. 31, 2017

Fair Value Disclosures [Abstract]

Summary of financial assets at fair value

The table below sets forth, by level, the Company’s financial assets and liabilities that are accounted for at fair value at March 31, 2017:

			Quoted Prices in Active Markets for Identical Assets or Liabilities		Significant Other Observable Inputs
	Fair Value		Level 1		Level 2
	(In thousands)
Assets:
Contract to sell power included in Other current assets and Other assets	$	23,308	$	—	$	23,308
Available-for-sale investments included in Restricted investments and bond collateral	79,180		79,180		—
Available-for-sale investments included in Reclamation deposits	72,638		72,638		—
	$	175,126	$	151,818	$	23,308
Liabilities:
Contracts to purchase power included in Other current liabilities and Other liabilities	$	32,982	$	—	$	32,982
Warrants issued by WMLP included in Other liabilities	520		520
	$	33,502	$	520	$	32,982

Estimated fair values of Company's debt

The estimated fair values of the Company’s debt with fixed and variable interest rates are as follows:

	Fixed Interest Rate				Variable Interest Rate
	Carrying Value		Fair Value		Carrying Value		Fair Value
	(In thousands)				(In thousands)
March 31, 2017	$	398,824	$	389,495	$	693,318	$	664,991
December 31, 2016	409,362		395,274		699,704		658,557