ASSET RETIREMENT OBLIGATIONS (Tables)

12 Months Ended

Dec. 31, 2016

Asset Retirement Obligation Disclosure [Abstract]

Summary of asset retirement obligations, contractual third-party reclamation receivables and reclamation deposits

The asset retirement obligation (“ARO”) liability at December 31, 2016 is summarized below:

	Asset Retirement Obligations
	(In thousands)
Coal - U.S.	$	309,019
Coal - Canada	121,730
Coal - WMLP	52,177
Power	1,115
Total	$	484,041

Changes in Company's asset retirement obligations

Changes in the Company’s asset retirement obligations were as follows:

	Years Ended December 31,
	2016			2015
	(In thousands)
				Restated
Asset retirement obligations, beginning of year (including current portion)	$	419,763		$	452,745
Accretion	40,424			38,891
Liabilities settled	(32,087		)	(30,363		)
Changes due to amount and timing of reclamation	7,191			(24,533		)
Asset retirement obligations acquired	45,404			4,146
Changes due to foreign currency translation	3,346			(21,123		)
Asset retirement obligations, end of year	484,041			419,763
Less current portion	(32,207		)	(40,571		)
Asset retirement obligations, less current portion	$	451,834		$	379,192