Annual report pursuant to Section 13 and 15(d)

Quarterly Results of Operations (Unaudited) (Tables)

v3.6.0.2
Quarterly Results of Operations (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2016
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, 2016 and 2015: 
 
 
2016
 
 
March 31
 
June 30
 
September 30
 
December 31
Operating revenue
 
229,548

 
238,637

 
249,552

 
264,793

Income from operations
 
21,404

 
(14,348
)
 
24,700

 
28,223

Net income
 
13,099

 
(10,066
)
 
11,931

 
12,706

 
 
 
 
 
 
 
 
 
Net income per share:
 
 
 
 
 
 
 
 
   Basic
 
$
0.43

 
$
(0.33
)
 
$
0.39

 
$
0.42

   Diluted
 
$
0.43

 
$
(0.33
)
 
$
0.39

 
$
0.42

 
 
 
 
 
 
 
 
 
 
 
2015
 
 
March 31
 
June 30
 
September 30
 
December 31
Operating revenue
 
$
205,918

 
$
249,694

 
$
247,093

 
$
256,420

Income from operations
 
8,248

 
19,908

 
24,601

 
29,015

Net income
 
4,836

 
11,824

 
15,687

 
23,228

 
 
 
 
 
 
 
 
 
Net income per share:
 
 
 
 
 
 
 
 
   Basic
 
$
0.16

 
$
0.38

 
$
0.51

 
$
0.75

   Diluted
 
$
0.16

 
$
0.38

 
$
0.50

 
$
0.75