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Selected Quarterly Financial Data (Unaudited)
 12 Months Ended
Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]  
Selected Quarterly Financial Data (Unaudited)
Selected Quarterly Financial Data (Unaudited)

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.