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Selected Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2017
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
 
(in thousands, except per share amounts)
2017
 
 
 
 
 
 
 
Revenues
$
404,490

 
$
470,876

 
$
491,355

 
$
499,410

Operating costs and expenses
$
373,780

 
$
439,313

 
$
459,864

 
$
466,285

Income before income taxes
$
32,279

 
$
33,078

 
$
32,930

 
$
34,678

Net income
$
22,017

 
$
22,551

 
$
23,472

 
$
20,186

Basic earnings per common share
$
0.30

 
$
0.31

 
$
0.32

 
$
0.27

Diluted earnings per common share
$
0.30

 
$
0.30

 
$
0.31

 
$
0.27

Cash dividends declared per common share
$
0.18750

 
$
0.18875

 
$
0.19000

 
$
0.19125

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