XML 58 R43.htm IDEA: XBRL DOCUMENT v3.10.0.1
Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]  
Quarterly results of operations Quarterly results of operations for the years ended December 31, 2018 and 2017 are summarized below:
 
 
Three Months Ended
 
 
March 31
 
June 30
 
September 30
 
December 31
 
 
(in thousands, except per-share amounts)
2018
 
 
 
 
 
 
 
 
Operating revenue
 
$
704,138

 
$
851,771

 
$
904,330

 
$
862,795

Operating income (loss)
 
(38,797
)
 
108,521

 
145,125

 
136,065

Net income (loss)
 
(44,922
)
 
11,254

 
97,480

 
91,937

Basic earnings (loss) per share
 
(0.66
)
 
0.16

 
1.43

 
1.35

Diluted earnings (loss) per share
 
(0.66
)
 
0.16

 
1.42

 
1.34

 
 
 
 
 
 
 
 
 
2017
 
 
 
 
 
 
 
 
Operating revenue
 
$
589,957

 
$
700,185

 
$
687,227

 
$
666,182

Operating income
 
58,342

 
131,312

 
103,874

 
91,296

Net income (1)
 
31,261

 
77,241

 
60,044

 
246,975

Basic earnings per share (1)
 
0.45

 
1.11

 
0.87

 
3.59

Diluted earnings per share (1)
 
0.45

 
1.11

 
0.86

 
3.58