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Quarterly Financial Information (Tables)
 12 Months Ended
Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Results Of Consolidated Operations

The following table presents the unaudited quarterly results of consolidated operations for 2019, 2018 and 2017.

 
Quarters Ended
(dollars in thousands, except per share amounts)
Mar. 31
 
June 30
 
Sept. 30
 
Dec. 31
2019
 
 
 
 
 
 
 
Operating revenues
$
2,472,488

 
$
2,439,116

 
$
2,033,058

 
$
2,581,529

Net income (1)
577,513

 
506,483

 
203,953

 
511,513

Net income to shareholders (1)
576,427

 
497,298

 
205,637

 
511,104

Comprehensive income to shareholders
732,245

 
623,330

 
250,069

 
488,244

Net income per share:
 
 
 
 
 
 
 
Basic
$
42.81

 
$
36.10

 
$
13.97

 
$
36.34

Diluted
$
42.76

 
$
36.07

 
$
13.95

 
$
36.26

2018
 
 
 
 
 
 
 
Operating revenues
$
1,575,471

 
$
1,987,013

 
$
2,235,949

 
$
1,042,852

Net income (loss) (1)
(65,594
)
 
279,587

 
409,028

 
(753,374
)
Net income (loss) to shareholders (1)
(64,306
)
 
278,231

 
409,438

 
(751,543
)
Comprehensive income (loss) to shareholders
(174,839
)
 
164,336

 
315,106

 
(680,373
)
Net income (loss) per share:
 
 
 
 
 
 
 
Basic
$
(4.25
)
 
$
20.01

 
$
28.56

 
$
(53.88
)
Diluted
$
(4.25
)
 
$
19.97

 
$
28.50

 
$
(53.88
)
2017
 
 
 
 
 
 
 
Operating revenues
$
1,411,751

 
$
1,481,493

 
$
1,506,148

 
$
1,662,267

Net income (loss) (1)
71,040

 
151,427

 
(261,035
)
 
439,326

Net income (loss) to shareholders (1)
69,869

 
149,660

 
(259,141
)
 
434,881

Comprehensive income (loss) to shareholders
223,239

 
342,357

 
(19,869
)
 
629,247

Net income (loss) per share:
 
 
 
 
 
 
 
Basic
$
3.91

 
$
10.34

 
$
(18.82
)
 
$
30.48

Diluted
$
3.90

 
$
10.31

 
$
(18.82
)
 
$
30.39


(1) 
Effective January 1, 2018, the Company adopted ASU No. 2016-01. As a result, the change in fair value of equity securities is no longer recognized in other comprehensive income; rather, all changes in the fair value of equity securities are now recognized in net income. Prior periods have not been restated to conform to the current presentation.