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Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]  
Quarterly results of operations
Quarterly results of operations for the years ended December 31, 2019 and 2018 are summarized below:
 
 
Three Months Ended
 
 
March 31
 
June 30
 
September 30
 
December 31
 
 
(in thousands, except per-share amounts)
2019
 
 
 
 
 
 
 
 
Operating revenue
 
$
855,796

 
$
1,012,956

 
$
991,968

 
$
969,816

Operating income
 
87,804

 
163,938

 
124,681

 
124,624

Net income
 
56,076

 
114,501

 
83,464

 
81,214

Basic earnings per share
 
0.82

 
1.67

 
1.22

 
1.19

Diluted earnings per share
 
0.82

 
1.67

 
1.22

 
1.18

 
 
 
 
 
 
 
 
 
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