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, 2011
Quarterly Results of Operations (Unaudited) [Abstract]  
Schedule of Quarterly Financial Information [Table Text Block]
 
 
2011
 
 
March 31
 
June 30
 
September 30
 
December 31
Operating revenue
 
$
120,201

 
$
132,192

 
$
135,749

 
$
148,259

Income from operations
 
13,286

 
19,876

 
20,320

 
23,629

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

 
 
 
 
 
 
 
 
 
 
 
2010
 
 
March 31
 
June 30
 
September 30
 
December 31
Operating revenue
 
$
106,977

 
$
122,132

 
$
121,522

 
$
133,308

Income from operations
 
6,055

 
13,502

 
15,505

 
18,677

Net income
 
3,419

 
7,912

 
8,888

 
11,817

 
 
 
 
 
 
 
 
 
Net income per share:
 
 
 
 
 
 
 
 
   Basic
 
$
0.12

 
$
0.27

 
$
0.31

 
$
0.41

   Diluted
 
$
0.12

 
$
0.27

 
$
0.31

 
$
0.41