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Quarterly Financial Data (Tables)
 12 Months Ended
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Financial Data
The following table sets forth the Company's quarterly results for the years ended December 31, 2017 and 2016 (dollars in thousands, except per share data):
 
 
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
2017
 
 
 
 
 
 
 
 
Operating revenues
 
$
519,108

 
$
540,433

 
$
576,927

 
$
571,576

Operating income
 
$
77,454

 
$
101,340

 
$
111,489

 
$
108,179

Net income attributable to G&W
 
$
26,238

 
$
46,007

 
$
50,240

 
$
426,566

Basic earnings per common share attributable to G&W
 
$
0.43

 
$
0.75

 
$
0.82

 
$
6.90

Diluted earnings per common share attributable to G&W
 
$
0.42

 
$
0.74

 
$
0.80

 
$
6.81

 
 
 
 
 
 
 
 
 
2016
 
 
 
 
 
 
 
 
Operating revenues
 
$
482,616

 
$
501,375

 
$
501,002

 
$
516,534

Operating income
 
$
56,996

 
$
87,194

 
$
91,851

 
$
53,571

Net income attributable to G&W

 
$
27,019

 
$
48,399

 
$
56,785

 
$
8,934

Basic earnings per common share attributable to G&W
 
$
0.47

 
$
0.85

 
$
0.99

 
$
0.15

Diluted earnings per common share attributable to G&W
 
$
0.47

 
$
0.83

 
$
0.98

 
$
0.15