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Selected Quarterly Financial Data (Unaudited)
 12 Months Ended
Dec. 31, 2016
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
 
(in thousands, except per share amounts)
2016
 
 
 
 
 
 
 
Revenues
$
384,807

 
$
386,556

 
$
392,734

 
$
398,565

Operating costs and expenses
$
355,390

 
$
357,875

 
$
363,522

 
$
368,122

Income before income taxes
$
29,604

 
$
29,683

 
$
30,571

 
$
30,529

Net income
$
18,626

 
$
18,760

 
$
19,711

 
$
20,299

Basic earnings per common share
$
0.26

 
$
0.26

 
$
0.27

 
$
0.28

Diluted earnings per common share
$
0.26

 
$
0.26

 
$
0.27

 
$
0.28

Cash dividends declared per common share
$
0.18250

 
$
0.18375

 
$
0.18500

 
$
0.18625

2015
 
 
 
 
 
 
 
Revenues
$
355,246

 
$
355,356

 
$
360,165

 
$
366,082

Operating costs and expenses
$
330,699

 
$
329,341

 
$
332,090

 
$
355,667

Income before income taxes
$
25,054

 
$
26,257

 
$
26,741

 
$
11,712

Net income
$
15,516

 
$
16,288

 
$
17,086

 
$
9,134

Basic earnings per common share
$
0.22

 
$
0.23

 
$
0.24

 
$
0.13

Diluted earnings per common share
$
0.22

 
$
0.23

 
$
0.24

 
$
0.13

Cash dividends declared per common share
$
0.17750

 
$
0.17875

 
$
0.18000

 
$
0.18125