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ASSET RETIREMENT OBLIGATIONS, CONTRACTUAL THIRD-PARTY RECLAMATION RECEIVABLES, AND RECLAMATION DEPOSITS (Tables)
 6 Months Ended
Jun. 30, 2015
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 June 30, 2015 are summarized below:
 
Asset
Retirement
Obligation
 
Contractual
Third-Party
Reclamation
Receivable
 
Reclamation
Deposits
 
(In thousands)
Coal - U.S.
$
296,067

 
$
109,223

 
$
76,952

Coal - Canada
121,312

 
6,137

 
—

Coal - WMLP
32,886

 
—

 
—

Power
998

 
—

 
—

Total
$
451,263

 
$
115,360

 
$
76,952
Changes in Company's asset retirement obligations
Changes in the Company’s asset retirement obligations were as follows: 
 
Six Months Ended June 30,
 
2015
 
2014
 
(In thousands)
Asset retirement obligations, beginning of year (including current portion)
$
452,745

 
$
279,864

Accretion
19,452

 
14,003

Liabilities settled
(17,484
)
 
(10,250
)
Changes due to amount and timing of reclamation
1,769

 
—

Asset retirement obligations acquired
3,769

 
102,075

Changes due to foreign currency translation
(8,988
)
 
3,692

Asset retirement obligations, end of period
451,263

 
389,384

Less current portion
(49,860
)
 
(31,131
)
Asset retirement obligations, less current portion
$
401,403

 
$
358,253
Carrying value and estimated fair value of reclamation deposits
The Company’s carrying value and estimated fair value of its reclamation deposits at June 30, 2015 were as follows: 
 
Carrying Value
 
Fair Value
 
Fair Value Hierarchy
 
(In thousands)
 
 
Cash and cash equivalents
$
43,725

 
$
43,725

 
Level 1
Available-for-sale securities
33,227

 
33,227

 
Level 1
 
$
76,952

 
$
76,952


 
Available for sale reclamation deposits
The cost basis, gross unrealized holding gains and losses, and fair value of available-for-sale securities at June 30, 2015 were as follows (in thousands):
Cost basis
$
33,454

Gross unrealized holding gains
617

Gross unrealized holding losses
(844
)
Fair value
$
33,227
Reclamation Deposits  
Schedule of Available-for-sale Securities [Line Items]  
Investments Classified by Contractual Maturity Date
Maturities of available-for-sale securities were as follows at June 30, 2015:
 
Cost Basis
 
Fair Value
 
(In thousands)
Within one year
$
—

 
$
—

Due in five years or less
18,393

 
18,425

Due after five years to ten years
6,118

 
5,839

Due in more than ten years
8,943

 
8,963

 
$
33,454

 
$
33,227