Annual report pursuant to Section 13 and 15(d)

Quarterly Results of Operations (Unaudited) (Tables)

v3.19.3.a.u2
Quarterly Results of Operations (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2019
Quarterly Results of Operations (Unaudited) [Abstract]  
Schedule of Quarterly Financial Information [Table Text Block]

The following is a summary of the quarterly results of operations for the years ended December 31, 2019 and 2018: 
 
 
2019
 
 
March 31
 
June 30
 
September 30
 
December 31
Operating revenue
 
$
321,471

 
$
345,756

 
$
361,663

 
$
381,504

Income from operations
 
24,734

 
30,550

 
30,689

 
32,852

Net income
 
18,407

 
22,330

 
22,195

 
24,168

 
 
 
 
 
 
 
 
 
Net income per share:
 
 
 
 
 
 
 
 
   Basic
 
$
0.64

 
$
0.78

 
$
0.78

 
$
0.86

   Diluted
 
$
0.64

 
$
0.78

 
$
0.78

 
$
0.85

 
 
 
 
 
 
 
 
 
 
 
2018
 
 
March 31
 
June 30
 
September 30
 
December 31
Operating revenue
 
$
302,608

 
$
330,343

 
$
331,375

 
$
356,561

Income from operations
 
24,235

 
32,870

 
29,879

 
35,047

Net income
 
17,741

 
24,298

 
22,329

 
27,684

 
 
 
 
 
 
 
 
 
Net income per share:
 
 
 
 
 
 
 
 
   Basic
 
$
0.60

 
$
0.83

 
$
0.76

 
$
0.95

   Diluted
 
$
0.60

 
$
0.82

 
$
0.76

 
$
0.95