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Selected Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2015
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
2015
 
 
 
 
 
 
 
Revenues
$
355,246,000

 
$
355,356,000

 
$
360,165,000

 
$
366,082,000

Operating costs and expenses
$
330,699,000

 
$
329,341,000

 
$
332,090,000

 
$
355,667,000

Income before income taxes
$
25,054,000

 
$
26,257,000

 
$
26,741,000

 
$
11,712,000

Net income
$
15,516,000

 
$
16,288,000

 
$
17,086,000

 
$
9,134,000

Basic earnings per common share(1)
$
0.22

 
$
0.23

 
$
0.24

 
$
0.13

Diluted earnings per common share(1)
$
0.22

 
$
0.23

 
$
0.24

 
$
0.13

Cash dividends per common share(1)
$
0.18

 
$
0.18

 
$
0.18

 
$
0.18

2014
 
 
 
 
 
 
 
Revenues
$
312,165,000

 
$
319,295,000

 
$
320,099,000

 
$
341,624,000

Operating costs and expenses
$
289,417,000

 
$
298,055,000

 
$
355,132,000

 
$
320,499,000

Income before income taxes
$
23,129,000

 
$
22,043,000

 
$
(35,083,000
)
 
$
21,619,000

Net income
$
14,639,000

 
$
13,921,000

 
$
(22,182,000
)
 
$
15,472,000

Basic earnings per common share(1)
$
0.21

 
$
0.20

 
$
(0.31
)
 
$
0.22

Diluted earnings per common share(1)
$
0.21

 
$
0.20

 
$
(0.31
)
 
$
0.22

Cash dividends per common share(1)
$
0.17

 
$
0.17

 
$
0.17

 
$
0.18


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