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Reinsurance (Tables)
 12 Months Ended
Dec. 31, 2015
Reinsurance Disclosures [Abstract]  
Reinsurance Allowance For Doubtful Accounts
The following table summarizes the Company's reinsurance allowance for doubtful accounts.

 
Years Ended December 31,
(dollars in thousands)
2015
 
2014
 
2013
Reinsurance allowance, beginning of year
$
59,813

 
$
76,210

 
$
71,148

Additions
5,897

 
10,316

 
13,621

Deductions
(6,360
)
 
(26,713
)
 
(8,559
)
Reinsurance allowance, end of year
$
59,350

 
$
59,813

 
$
76,210
Effect Of Reinsurance On Premiums Written And Earned
The following table summarizes the effect of reinsurance and retrocessional reinsurance on premiums written and earned.

 
Years Ended December 31,
 
2015
 
2014
 
2013
(dollars in thousands)
Written
 
Earned
 
Written
 
Earned
 
Written
 
Earned
Direct
$
3,474,510

 
$
3,480,297

 
$
3,478,273

 
$
3,443,912

 
$
3,143,957

 
$
2,947,812

Assumed
1,158,402

 
1,194,772

 
1,327,240

 
1,298,371

 
776,269

 
1,016,853

Ceded
(813,619
)
 
(851,537
)
 
(888,498
)
 
(901,371
)
 
(683,543
)
 
(733,049
)
Net premiums
$
3,819,293

 
$
3,823,532

 
$
3,917,015

 
$
3,840,912

 
$
3,236,683

 
$
3,231,616