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Reinsurance (Tables)
 6 Months Ended
Jun. 30, 2017
Reinsurance Disclosures [Abstract]  
Effect Of Reinsurance And Retrocessional Reinsurance On Premiums Written And Earned
The following tables summarize the effect of reinsurance and retrocessional reinsurance on premiums written and earned.
 
Quarter Ended June 30,
 
2017
 
2016
(dollars in thousands)
Written
 
Earned
 
Written
 
Earned
Direct
$
1,046,833

 
$
914,249

 
$
957,244

 
$
865,943

Assumed
310,331

 
312,538

 
320,405

 
295,868

Ceded
(219,507
)
 
(193,213
)
 
(227,103
)
 
(210,952
)
Net premiums
$
1,137,657

 
$
1,033,574

 
$
1,050,546

 
$
950,859

 
Six Months Ended June 30,
 
2017
 
2016
(dollars in thousands)
Written
 
Earned
 
Written
 
Earned
Direct
$
1,896,317

 
$
1,777,235

 
$
1,836,332

 
$
1,733,387

Assumed
921,598

 
620,107

 
833,980

 
585,931

Ceded
(420,029
)
 
(381,166
)
 
(437,806
)
 
(410,773
)
Net premiums
$
2,397,886

 
$
2,016,176

 
$
2,232,506

 
$
1,908,545