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v3.19.1

Reinsurance (Effect of Reinsurance and Retrocessional Activity on Premiums Written and Earned and on Net Claims and Claim Expenses) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Premiums written |  |
Direct | $ 110,968 | $ 85,167
Assumed | 1,453,327 | 1,074,485
Ceded | (635,264) | (496,608)
Net premiums written | 929,031 | 663,044
Premiums earned |  |
Direct | 89,814 | 70,032
Assumed | 765,433 | 605,483
Ceded | (305,219) | (235,233)
Net premiums earned | 550,028 | 440,282
Claims and claim expenses |  |
Gross claims and claim expenses incurred | 338,119 | 225,742
Claims and claim expenses recovered | (111,084) | (54,039)
Net claims and claim expenses incurred | $ 227,035 | $ 171,703

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