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Reinsurance (List of direct, assumed and ceded Reinsurance Amounts) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Premiums Written: |  |  |  |  |  |  |  |  |  |  |
Direct |  |  |  |  |  |  |  |  | $ 2,577,259 | $ 2,403,519 | $ 2,228,270
Assumed |  |  |  |  |  |  |  |  | 28,779 | 23,848 | 26,306
Ceded premiums written |  |  |  |  |  |  |  |  | (368,750) | (357,463) | (369,296)
Net |  |  |  |  |  |  |  |  | 2,237,288 | 2,069,904 | 1,885,280
Premiums Earned: |  |  |  |  |  |  |  |  |  |  |
Direct |  |  |  |  |  |  |  |  | 2,484,715 | 2,330,267 | 2,183,258
Assumed |  |  |  |  |  |  |  |  | 28,214 | 23,209 | 34,653
Ceded premiums earned |  |  |  |  |  |  |  |  | (363,357) | (363,567) | (365,302)
Total Net Premiums Earned | $ 552,753 | $ 542,429 | $ 531,932 | $ 522,458 | $ 516,087 | $ 507,390 | $ 490,309 | $ 476,123 | 2,149,572 | 1,989,909 | 1,852,609
Losses and loss expenes incurred: |  |  |  |  |  |  |  |  |  |  |
Direct |  |  |  |  |  |  |  |  | 1,560,356 | 1,274,872 | 1,314,864
Assumed |  |  |  |  |  |  |  |  | 22,708 | 16,996 | 26,187
Ceded losses and loss expenses incurred |  |  |  |  |  |  |  |  | (348,267) | (143,327) | (183,550)
Net |  |  |  |  |  |  |  |  | $ 1,234,797 | $ 1,148,541 | $ 1,157,501

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