Asset Retirement Obligations (Tables)

12 Months Ended

Dec. 31, 2014

Asset Retirement Obligation Disclosure [Abstract]

Schedule of Changes in the Asset Retirement Obligations

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

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(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.