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v3.20.4

Reinsurance - Effects of reinsurance (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Premiums Written |  |  |  |  |  |  |  |  |  |  |
Direct |  |  |  |  |  |  |  |  | $ 6,553,910 | $ 5,681,523 | $ 4,838,902
Assumed |  |  |  |  |  |  |  |  | 3,534,158 | 2,457,437 | 2,122,102
Ceded |  |  |  |  |  |  |  |  | (2,650,352) | (2,099,893) | (1,614,257)
Net premiums written | $ 1,758,015 | $ 1,874,144 | $ 1,668,311 | $ 2,137,246 | $ 1,455,453 | $ 1,613,457 | $ 1,444,898 | $ 1,525,259 | 7,437,716 | 6,039,067 | 5,346,747
Premiums Earned |  |  |  |  |  |  |  |  |  |  |
Direct |  |  |  |  |  |  |  |  | 6,361,451 | 5,447,829 | 4,799,842
Assumed |  |  |  |  |  |  |  |  | 3,213,873 | 2,337,950 | 1,988,038
Ceded |  |  |  |  |  |  |  |  | (2,583,389) | (1,999,281) | (1,555,905)
Net premiums earned | $ 1,811,045 | $ 1,771,092 | $ 1,665,354 | $ 1,744,444 | $ 1,515,882 | $ 1,438,023 | $ 1,463,727 | $ 1,368,866 | 6,991,935 | 5,786,498 | 5,231,975
Losses and Loss Adjustment Expenses |  |  |  |  |  |  |  |  |  |  |
Direct |  |  |  |  |  |  |  |  | 4,392,392 | 2,953,072 | 2,472,133
Assumed |  |  |  |  |  |  |  |  | 2,204,323 | 1,602,528 | 1,307,317
Ceded |  |  |  |  |  |  |  |  | (1,907,116) | (1,422,148) | (889,344)
Net |  |  |  |  |  |  |  |  | $ 4,689,599 | $ 3,133,452 | $ 2,890,106

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