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ASSET RETIREMENT OBLIGATIONS, CONTRACTUAL THIRD-PARTY RECLAMATION RECEIVABLES, AND RECLAMATION DEPOSITS (Tables)
 6 Months Ended
Jun. 30, 2014
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 operating segments at June 30, 2014 are summarized below: 
 
Asset
Retirement
Obligation
 
Contractual
Third-Party
Reclamation
Receivable
 
Reclamation
Deposits
 
(In thousands)
Coal - U.S.
$
281,346

 
$
95,157

 
$
75,911

Coal - Canada
107,111

 
6,739

 
—

Power
927

 
—

 
—

Total
$
389,384

 
$
101,896

 
$
75,911
Changes in Company's asset retirement obligations
Changes in the Company’s asset retirement obligations were as follows: 
 
Six Months Ended June 30,
 
2014
 
2013
 
(In thousands)
Asset retirement obligations, beginning of year (including current portion)
$
279,864

 
$
263,847

Accretion
14,003

 
10,951

Liabilities settled
(10,250
)
 
(11,647
)
ARO acquired
102,075

 
—

Changes due to foreign currency translation
3,692

 
—

Asset retirement obligations, end of period
389,384

 
263,151

Less current portion
(31,131
)
 
(24,105
)
Asset retirement obligations, less current portion
$
358,253

 
$
239,046
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, 2014 are as follows: 
 
Carrying Value
 
Fair Value
 
Fair Value Hierarchy
 
(In thousands)
 
 
Cash and cash equivalents
$
44,089

 
$
44,089

 
Level 1
Held-to-maturity securities
31,822

 
32,601

 
Level 2
 
$
75,911

 
$
76,690


 
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 June 30, 2014 are as follows (in thousands):
Amortized cost
$
31,822

Gross unrealized holding gains
953

Gross unrealized holding losses
(174
)
Fair value
$
32,601
Reclamation Deposits
  
Schedule of Held-to-maturity Securities [Line Items]  
Schedule of maturities of held-to-maturity investments
Maturities of held-to-maturity securities are as follows at June 30, 2014:
 
Amortized Cost
 
Fair Value
 
(In thousands)
Within one year
$
1,025

 
$
998

Due in five years or less
17,341

 
17,829

Due after five years to ten years
7,289

 
7,424

Due in more than ten years
6,167

 
6,350

 
$
31,822

 
$
32,601