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Quarterly Financial Information (Tables)
 12 Months Ended
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Financial Information
(unaudited, $ in thousands,
 
First Quarter
 
Second Quarter
 
Third Quarter
 
Fourth Quarter
except per share data)
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
 
2017 1
 
2016
Net premiums earned
 
$
560,854

 
522,458

 
568,030

 
531,932

 
572,055

 
542,429

 
590,088

 
552,753

Net investment income earned
 
37,419

 
30,769

 
41,430

 
31,182

 
40,446

 
33,375

 
42,587

 
35,428

Net realized (losses) gains
 
(1,045
)
 
(2,704
)
 
1,734

 
1,765

 
6,798

 
3,688

 
(1,128
)
 
(7,686
)
Other income
 
3,241

 
951

 
3,291

 
3,868

 
1,994

 
2,199

 
2,190

 
1,863

Total revenues
 
600,469

 
551,474

 
614,485

 
568,747

 
621,293

 
581,691

 
633,737

 
582,358

Income before federal income taxes
 
67,574

 
51,875

 
58,929

 
62,311

 
67,315

 
55,443

 
68,150

 
50,326

Net income
 
50,440

 
37,032

 
41,426

 
43,601

 
46,718

 
38,502

 
30,242

 
39,360

Net income per share:
 
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

Basic
 
0.87

 
0.64

 
0.71

 
0.75

 
0.80

 
0.66

 
0.52

 
0.68

Diluted
 
0.85

 
0.63

 
0.70

 
0.74

 
0.79

 
0.66

 
0.51

 
0.67

1 Results for the fourth quarter of 2017 include the impact of the $20.2 million write off of deferred tax assets required with the implementation of Tax Reform. See Note 13. "Federal Income Taxes" above for additional information.

The addition of all quarters may not agree to annual amounts on the Financial Statements due to rounding.