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Quarterly Financial Data (Unaudited)
 12 Months Ended
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Financial Data (Unaudited)
QUARTERLY FINANCIAL DATA (UNAUDITED)
The condensed quarterly results of operations for the years ended December 31, 2017 and 2016 (in thousands of dollars, except per share data) were as follows:
 
 
 
Quarter Ended
 
 
March 31,
 
June 30,
 
September 30,
 
December 31,
 
 
2017
 
2017
 
2017
 
2017
 
 
(Thousands of dollars, except per share data)
Operating revenues, net
 
$
134,618

 
$
146,424

 
$
150,167

 
$
148,336

(Loss) gain on disposition of assets, net
 
—

 
7

 
4

 
287

(Loss) earnings before income taxes
 
(23,073
)
 
(3,150
)
 
(4,899
)
 
(20,319
)
Net (loss) earnings
 
(15,248
)
 
(3,273
)
 
(3,277
)
 
29,330

Net (loss) earnings per share
 
 
 
 
 
 
 
 
Basic
 
(0.97
)
 
(0.21
)
 
(0.21
)
 
1.87

Diluted
 
(0.97
)
 
(0.21
)
 
(0.21
)
 
1.87

 
 
Quarter Ended
 
 
March 31,
 
June 30,
 
September 30,
 
December 31,
 
 
2016
 
2016
 
2016
 
2016
 
 
(Thousands of dollars, except per share data)
Operating revenues, net
 
$
164,016

 
$
167,136

 
$
158,093

 
$
144,853

Gain (loss) on disposition of assets, net
 
(359
)
 
4,298

 
(85
)
 
(504
)
Earnings before income taxes
 
(7,488
)
 
117

 
(7,766
)
 
(12,012
)
Net earnings
 
(8,932
)
 
4,277

 
(4,967
)
 
(17,058
)
Net earnings per share
 
 
 
 
 
 
 
 
Basic
 
(0.57
)
 
0.27

 
(0.32
)
 
(1.08
)
Diluted
 
(0.57
)
 
0.27

 
(0.32
)
 
(1.08
)