Quarterly Financial Data (Unaudited)

12 Months Ended

Dec. 31, 2012

Quarterly Financial Information Disclosure [Abstract]

QUARTERLY FINANCIAL DATA (UNAUDITED)

(14) QUARTERLY FINANCIAL DATA (UNAUDITED)

The condensed quarterly results of operations for the years ended December 31, 2012 and 2011 (in thousands of dollars, except per share data) are as follows:

	Quarter Ended
	March 31,		June 30,		September 30,			December 31,
	2012		2012		2012			2012
	(Thousands of dollars, except per share data)
Operating revenues, net	$	138,051	$	160,554	$	170,857		$	177,224
Gain (loss) on disposition of assets, net		11		679		(701	)		(306	)
Earnings before income taxes		3,630		10,090		11,440			8,889
Net earnings		2,178		6,054		6,384			3,441
Net earnings per share
Basic		0.14		0.40		0.42			0.22
Diluted		0.14		0.39		0.41			0.22

	Quarter Ended
	March 31,			June 30,		September 30,			December 31,
	2011			2011		2011			2011
	(Thousands of dollars, except per share data)
Operating revenues	$	119,640		$	135,976	$	145,576		$	138,434
Gain (loss) on disposition of assets, net		146			77		(638	)		113
(Loss) earnings before income taxes		(4,452	)		1,206		5,969			5,363
Net (loss) earnings		(2,671	)		723		3,582			3,218
Net (loss) earnings per share
Basic		(0.17	)		0.05		0.23			0.21
Diluted		(0.17	)		0.05		0.23			0.20