FAIR VALUE MEASUREMENTS (Tables)

9 Months Ended

Sep. 30, 2016

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 September 30, 2016:

			Quoted Prices in Active Markets for Identical Assets or Liabilities		Significant Other Observable Inputs
	Fair Value		Level 1		Level 2
	(In thousands)
Assets:
Available-for-sale investments included in Restricted investments	$	77,677	$	77,677	$	—
Available-for-sale investments included in Reclamation deposits	71,734		71,734		—
Total assets	$	149,411	$	149,411	$	—
Liabilities:
Contracts to purchase power included in Other current liabilities and Other liabilities	$	39,164	$	—	$	39,164
Warrants issued by WMLP included in Other liabilities	610		610		—
Total liabilities	$	39,774	$	610	$	39,164

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)
September 30, 2016	$	337,368	$	276,500	$	726,802	$	595,591
December 31, 2015	$	336,000	$	213,500	$	612,727	$	397,601