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FAIR VALUE MEASUREMENTS (Tables)
 3 Months Ended
Mar. 31, 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 March 31, 2016:
 
Fair
 
Quoted Prices in Active Markets for Identical Assets or Liabilities
 
Significant Other Observable Inputs
 
Value
 
Level 1
 
Level 2
(In thousands)
Assets:
 
 
 
 
 
Available-for-sale investments included in Restricted investments
$
54,942

 
$
54,942

 
$
—

Available-for-sale investments included in Reclamation deposits
48,253

 
48,253

 
—

Total assets
$
103,195

 
$
103,195

 
$
—

Liabilities:
 
 
 
 
 
Contracts to purchase power included in Other current liabilities and Other liabilities
$
(39,767
)
 
$
—

 
$
(39,767
)
Warrants issued by WMLP included in Other liabilities
(557
)
 
(557
)
 
—

Total liabilities
$
(40,324
)
 
$
(557
)
 
$
(39,767
)
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, 2016
$
346,114

 
$
204,750

 
$
737,997

 
$
440,250

December 31, 2015
$
345,984

 
$
213,500

 
$
619,341

 
$
388,380