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Asset Retirement Obligations
 12 Months Ended
Dec. 31, 2014
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligations
Asset Retirement Obligations
As of December 31, 2014 and 2013, asset retirement obligation accruals for mine reclamation and closure costs were $112.3 million and $116.4 million, respectively. The portion of the costs expected to be paid within a year of $22.7 million and $23.9 million as of December 31, 2014 and 2013, respectively, is included in other current liabilities. The portion of costs expected to be incurred beyond one year of $89.6 million and $92.5 million as of December 31, 2014 and 2013, respectively, is included in other long-term liabilities. There were no assets that were legally restricted for purposes of settling asset retirement obligations at December 31, 2014 or 2013.
Changes in the asset retirement obligations are as follows:
 
December 31,
 
2014
 
2013
Balance at beginning of year
$
116,393

 
$
89,478

Accretion expense
11,011

 
9,079

Revisions in estimated cash flows
(87
)
 
26,453

Obligations settled
(10,941
)
 
(8,617
)
Obligations held for sale (1)
(4,049
)
 
—

Balance at end of year
$
112,327

 
$
116,393


_____________________________

(1) In the fourth quarter of 2014, the Company determined that the Gauley Eagle operations within the Company's U.S. Operations segment located in West Virginia met the criteria to be classified as held for sale. See Note 4 to the Consolidated Financial Statements.