ACQUISITION (Tables)

3 Months Ended

Mar. 31, 2017

Business Acquisition [Line Items]

Summary of pro forma information

The following unaudited pro forma information has been prepared for illustrative purposes only and assumes the San Juan Acquisition occurred on January 1, 2016. The unaudited pro forma results have been prepared based on estimates and assumptions, which the Company believes are reasonable, however, they are not necessarily indicative of the consolidated results of operations had the acquisitions occurred on the dates indicated above, or of future results of operations.

	Three Months Ended March 31, 2016
	(In thousands, except per share data)
Total revenues
As reported	$	355,854
Pro forma (unaudited)	382,129
Operating income
As reported	$	7,619
Pro forma (unaudited)	8,714
Net income applicable to common shareholders
As reported	$	27,407
Pro forma (unaudited)	27,832
Net income per share applicable to common shareholders (basic and diluted)
As reported	$	1.50
Pro forma (unaudited)	1.52

San Juan Coal Company

Business Acquisition [Line Items]

Summary of purchase consideration and allocation of purchase consideration