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Quarterly Financial Data (Tables)
 12 Months Ended
Dec. 31, 2015
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, 2015 and 2014 (dollars in thousands, except per share data):
 
 
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
2015
 
 
 
 
 
 
 
 
Operating revenues
 
$
397,030

 
$
542,219

 
$
546,299

 
$
514,853

Income from operations
 
$
72,620

 
$
99,451

 
$
117,559

 
$
94,631

Net income
 
$
23,904

 
$
52,837

 
$
63,362

 
$
84,934

Diluted earnings per common share
 
$
0.42

 
$
0.92

 
$
1.10

 
$
1.47

 
 
 
 
 
 
 
 
 
2014
 
 
 
 
 
 
 
 
Operating revenues
 
$
376,279

 
$
414,563

 
$
432,543

 
$
415,627

Income from operations
 
$
74,875

 
$
110,109

 
$
123,116

 
$
113,471

Net income
 
$
40,004

 
$
60,728

 
$
72,650

 
$
87,373

Diluted earnings per common share
 
$
0.70

 
$
1.07

 
$
1.27

 
$
1.53