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Quarterly Operating Results (Tables)
 12 Months Ended
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Financial Information [Table Text Block] Quarterly operating results for 2018 and 2017 were as follows:
(in thousands, except per share data)
 
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
 
2018
 
 

 
 

 
 

 
 

 
Total revenues
 
$
501,461

 
$
473,187

 
$
530,850

 
$
508,748

 
Total expenses
 
$
383,020

 
$
372,277

 
$
388,350

 
$
408,137

 
Income before income taxes
 
$
118,441

 
$
100,910

 
$
142,500

 
$
100,611

 
Net income
 
$
90,828

 
$
73,922

 
$
106,053

 
$
73,452

 
Net income per share:
 
 
 
 
 
 
 
 
 
Basic
 
$
0.33

 
$
0.27

 
$
0.38

 
$
0.26

 
Diluted
 
$
0.32

 
$
0.26

 
$
0.38

 
$
0.26

 
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(1)
 
$
0.25

 
$
0.24

 
$
0.27

 
$
0.68

 
Diluted(1)
 
$
0.25

 
$
0.23

 
$
0.27

 
$
0.66

(2)