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Quarterly Operating Results (Notes)
 12 Months Ended
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Financial Information [Text Block] Quarterly Operating Results (Unaudited)
Quarterly operating results for 2017 and 2016 were as follows:
(in thousands, except per share data)
 
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
 
2017
 
 

 
 

 
 

 
 

 
Total revenues
 
$
465,080

 
$
466,305

 
$
475,646

 
$
474,316

 
Total expenses
 
$
354,113

 
$
358,303

 
$
351,227

 
$
367,982

 
Income before income taxes
 
$
110,967

 
$
108,002

 
$
124,419

 
$
106,334

 
Net income
 
$
70,110

 
$
66,102

 
$
75,913

 
$
187,505

 
Net income per share:
 
 
 
 
 
 
 
 
 
Basic
 
$
0.50

 
$
0.47

 
$
0.54

 
$
1.35

 
Diluted
 
$
0.49

 
$
0.46

 
$
0.53

 
$
1.32

(1) 
2016
 
 
 
 
 
 
 
 
 
Total revenues
 
$
424,173

 
$
446,518

 
$
462,274

 
$
433,664

 
Total expenses
 
$
321,624

 
$
337,441

 
$
345,302

 
$
338,763

 
Income before income taxes
 
$
102,549

 
$
109,077

 
$
116,972

 
$
94,901

 
Net income
 
$
62,070

 
$
66,250

 
$
71,545

 
$
57,626

 
Net income per share:
 
 
 
 
 
 
 
 
 
Basic
 
$
0.45

 
$
0.47

 
$
0.51

 
$
0.41

 
Diluted
 
$
0.44

 
$
0.47

 
$
0.50

 
$
0.41

 
(1)
Includes $0.85 impact associated with recording impact of Tax Reform Act.
Quarterly financial results are affected by seasonal variations. The timing of the Company’s receipt of profit-sharing contingent commissions, policy renewals and acquisitions may cause revenues, expenses and net income to vary significantly between quarters.