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Reinsurance (Tables)
 12 Months Ended
Dec. 31, 2015
Insurance [Abstract]  
Summary of the effect of reinsurance on premiums written and earned
The effect of reinsurance on premiums written and earned was as follows:
 (In thousands)
 
2015 Premiums
 
2014 Premiums
 
2013 Premiums
 
 
Written
 
Earned
 
Written
 
Earned
 
Written
 
Earned
Direct
 
$
780,982

 
$
772,968

 
$
761,043

 
$
755,623

 
$
566,745

 
$
568,629

Assumed
 
31,236

 
22,691

 
18,566

 
12,987

 
802

 
804

Ceded
 
(102,933
)
 
(101,510
)
 
(77,760
)
 
(68,879
)
 
(42,365
)
 
(41,514
)
Net premiums
 
$
709,285

 
$
694,149

 
$
701,849

 
$
699,731

 
$
525,182

 
$
527,919