Annual report pursuant to Section 13 and 15(d)

Quarterly Results of Operations (Unaudited) (Tables)

v2.4.0.6
Quarterly Results of Operations (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2012
Quarterly Results of Operations (Unaudited) [Abstract]  
Schedule of Quarterly Financial Information [Table Text Block]
 
 
2012
 
 
March 31
 
June 30
 
September 30
 
December 31
Operating revenue
 
$
137,081

 
$
148,326

 
$
143,514

 
$
155,525

Income from operations
 
16,789

 
23,083

 
19,626

 
24,034

Net income
 
10,273

 
14,167

 
12,267

 
15,961

 
 
 
 
 
 
 
 
 
Net income per share:
 
 
 
 
 
 
 
 
   Basic
 
$
0.36

 
$
0.49

 
$
0.42

 
$
0.55

   Diluted
 
$
0.35

 
$
0.48

 
$
0.41

 
$
0.54

 
 
 
 
 
 
 
 
 
 
 
2011
 
 
March 31
 
June 30
 
September 30
 
December 31
Operating revenue
 
$
120,201

 
$
132,192

 
$
135,749

 
$
148,260

Income from operations
 
13,286

 
19,876

 
20,320

 
23,628

Net income
 
7,869

 
11,969

 
12,912

 
14,449

 
 
 
 
 
 
 
 
 
Net income per share:
 
 
 
 
 
 
 
 
   Basic
 
$
0.27

 
$
0.41

 
$
0.44

 
$
0.51

   Diluted
 
$
0.27

 
$
0.40

 
$
0.44

 
$
0.50