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ASSET RETIREMENT OBLIGATIONS, CONTRACTUAL THIRD-PARTY RECLAMATION RECEIVABLES, AND RECLAMATION DEPOSITS (Tables)
 9 Months Ended
Sep. 30, 2013
Asset Retirement Obligation Disclosure [Abstract]  
Summary of asset retirement obligations, contractual third-party reclamation receivables and reclamation deposits
The asset retirement obligation, contractual third-party reclamation receivable, and reclamation deposits for each of the Company’s mines and ROVA at September 30, 2013 are summarized below: 
 
Asset
Retirement
Obligation
 
Contractual
Third-Party
Reclamation
Receivable
 
Reclamation
Deposits
 
(In thousands)
Rosebud
$
120,510

 
$
18,564

 
$
74,403

Jewett
72,927

 
72,927

 
—

Absaloka
27,717

 
418

 
—

Beulah
19,046

 
—

 
—

Kemmerer
17,022

 
—

 
—

Savage
5,103

 
—

 
—

ROVA
876

 
—

 
—

Total
$
263,201

 
$
91,909

 
$
74,403
Changes in Company's asset retirement obligations
Changes in the Company’s asset retirement obligations were as follows: 
 
Nine Months Ended September 30,
 
2013
 
2012
 
(In thousands)
Asset retirement obligations, beginning of year (including current portion)
$
263,847

 
$
247,478

Accretion
16,426

 
16,360

Liabilities settled
(17,072
)
 
(13,814
)
Changes due to amount and timing of reclamation
—

 
(4,757
)
ARO acquired
—

 
19,377

Asset retirement obligations, end of period
263,201

 
264,644

Less current portion
(25,038
)
 
(18,469
)
Asset retirement obligations, less current portion
$
238,163

 
$
246,175
Carrying value and estimated fair value of reclamation deposits
The Company’s carrying value and estimated fair value of its reclamation deposits at September 30, 2013 are as follows: 
 
Carrying Value
 
Fair Value
 
Fair Value Hierarchy
 
(In thousands)
 
 
Cash and cash equivalents
$
48,323

 
$
48,323

 
Level 1
Held-to-maturity securities
11,719

 
12,424

 
Level 2
Time deposits
14,361

 
14,361

 
Level 1
 
$
74,403

 
$
75,108


 
Amortized cost, gross unrealized holding gains and losses and fair value of held-to-maturity securities
The amortized cost, gross unrealized holding gains and losses and fair value of held-to-maturity securities at September 30, 2013 are as follows (in thousands):
Amortized cost
$
11,719

Gross unrealized holding gains
779

Gross unrealized holding losses
(74
)
Fair value
$
12,424
Schedule of maturities of held-to-maturity investments
Maturities of held-to-maturity securities are as follows at September 30, 2013:
 
Amortized Cost
 
Fair Value
 
(In thousands)
Within one year
$
26

 
$
28

Due in five years or less
6,664

 
7,011

Due after five years to ten years
3,118

 
3,236

Due in more than ten years
1,911

 
2,149

 
$
11,719

 
$
12,424