SUMMARIZED QUARTERLY FINANCIAL DATA (Unaudited)

12 Months Ended

Dec. 31, 2017

Quarterly Financial Information Disclosure [Abstract]

SUMMARIZED QUARTERLY FINANCIAL DATA (Unaudited)

SUMMARIZED QUARTERLY FINANCIAL DATA (Unaudited)

The following data summarizes quarterly operating results:

	Year ended December 31, 2017
(in thousands, except per share amounts)	First		Second		Third			Fourth
Revenues	$	240,921	$	256,824	$	191,504		$	271,796
Operating income (loss)	$	61,427	$	54,714	$	(17,822	)	$	46,817
Net income (loss)	$	33,403	$	29,481	$	(18,486	)	$	262,430
Diluted earnings per average common share	$	0.34	$	0.30	$	(0.19	)	$	2.68
Basic earnings per average common share	$	0.34	$	0.30	$	(0.19	)	$	2.70

	Year ended December 31, 2016
(in thousands, except per share amounts)	First			Second		Third		Fourth
Revenues	$	128,219		$	105,765	$	184,385	$	114,520
Operating income (loss)	$	(301,811	)	$	68,875	$	90,302	$	(68,596	)
Net income (loss)	$	(203,116	)	$	36,759	$	53,314	$	(54,470	)
Diluted earnings per average common share	$	(2.34	)	$	0.38	$	0.55	$	(0.56	)
Basic earnings per average common share	$	(2.34	)	$	0.38	$	0.55	$	(0.56	)