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Selected Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]  
Selected Quarterly Financial Data
The following tables summarize the unaudited quarterly financial data for the last two fiscal years.

 
First Quarter
 
Second Quarter
 
Third Quarter
 
Fourth Quarter
2012
 
 
 
 
 
 
 
Revenues
$
260,607,000

 
$
267,108,000

 
$
272,681,000

 
$
277,039,000

Operating costs and expenses
$
248,477,000

 
$
248,730,000

 
$
255,070,000

 
$
257,814,000

Income before income taxes
$
13,783,000

 
$
18,283,000

 
$
18,573,000

 
$
19,625,000

Net income
$
8,579,000

 
$
11,320,000

 
$
11,517,000

 
$
12,798,000

Basic earnings per common share(1)
$
0.13

 
$
0.17

 
$
0.17

 
$
0.19

Diluted earnings per common share(1)
$
0.13

 
$
0.17

 
$
0.17

 
$
0.19

Cash dividends per common share(1)
$
0.16

 
$
0.16

 
$
0.16

 
$
0.17

2011
 
 
 
 
 
 
 
Revenues
$
208,390,000

 
$
211,507,000

 
$
218,929,000

 
$
250,239,000

Operating costs and expenses
$
196,765,000

 
$
197,253,000

 
$
202,385,000

 
$
235,861,000

Income before income taxes
$
12,339,000

 
$
14,717,000

 
$
15,189,000

 
$
15,567,000

Net income
$
7,767,000

 
$
9,828,000

 
$
9,996,000

 
$
10,565,000

Basic earnings per common share(1)
$
0.12

 
$
0.15

 
$
0.15

 
$
0.16

Diluted earnings per common share(1)
$
0.12

 
$
0.15

 
$
0.15

 
$
0.16

Cash dividends per common share(1)
$
0.16

 
$
0.16

 
$
0.16

 
$
0.16


 
(1)
Year-to-date earnings and cash dividends per common share amounts may differ from the sum of quarterly amounts due to rounding.