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ASSET RETIREMENT OBLIGATIONS, CONTRACTUAL THIRD-PARTY RECLAMATION RECEIVABLES, AND RECLAMATION DEPOSITS (Tables)
 9 Months Ended
Sep. 30, 2014
Schedule of Available-for-sale Securities [Line Items]  
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 operating segments at September 30, 2014 are summarized below: 
 
Asset
Retirement
Obligation
 
Contractual
Third-Party
Reclamation
Receivable
 
Reclamation
Deposits
 
(In thousands)
Coal - U.S.
$
279,859

 
$
91,370

 
$
77,131

Coal - Canada
104,004

 
6,544

 
—

Power
944

 
—

 
—

Total
$
384,807

 
$
97,914

 
$
77,131
Changes in Company's asset retirement obligations
Changes in the Company’s asset retirement obligations were as follows: 
 
Nine Months Ended September 30,
 
2014
 
2013
 
(In thousands)
Asset retirement obligations, beginning of year (including current portion)
$
279,864

 
$
263,847

Accretion
23,329

 
16,426

Liabilities settled
(18,759
)
 
(17,072
)
ARO acquired
102,075

 
—

Changes due to foreign currency translation
(1,702
)
 
—

Asset retirement obligations, end of period
384,807

 
263,201

Less current portion
(29,529
)
 
(25,038
)
Asset retirement obligations, less current portion
$
355,278

 
$
238,163
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, 2014 were as follows: 
 
Carrying Value
 
Fair Value
 
Fair Value Hierarchy
 
(In thousands)
 
 
Cash and cash equivalents
$
44,248

 
$
44,248

 
Level 1
Available-for-sale securities
32,883

 
32,883

 
Level 1
 
$
77,131

 
$
77,131


 
Available for sale reclamation deposits
The cost basis, gross unrealized holding gains and losses, and fair value of available-for-sale securities at September 30, 2014 were as follows (in thousands):
Cost basis
$
32,232

Gross unrealized holding gains
911

Gross unrealized holding losses
(260
)
Fair value
$
32,883
Reclamation Deposits [Member]
  
Schedule of Available-for-sale Securities [Line Items]  
Investments Classified by Contractual Maturity Date [Table Text Block]
Maturities of available-for-sale securities were as follows at September 30, 2014:
 
Amortized Cost
 
Fair Value
 
(In thousands)
Within one year
$
530

 
$
475

Due in five years or less
16,397

 
16,840

Due after five years to ten years
7,793

 
7,856

Due in more than ten years
7,512

 
7,712

 
$
32,232

 
$
32,883