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FAIR VALUE MEASUREMENTS (Tables)
3 Months Ended
Mar. 31, 2013
Fair Value Disclosures [Abstract]  
Summary of financial assets at fair value
The table below sets forth, by level, the Company’s financial assets that are accounted for at fair value at March 31, 2013:
 
Level 1
(In thousands)
Assets:
 
Available-for-sale investments included in Restricted investments and bond collateral
$
192

Available-for-sale investments included in Reclamation deposits
1,039

Total assets
$
1,231

Estimated fair values of Company's debt
The estimated fair values of the Company’s debt with fixed interest rates are as follows:
 
Carrying Value
 
Fair Value
 
(In thousands)
December 31, 2012
$
345,408

 
$
359,753

March 31, 2013
$
341,284

 
$
366,292