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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, 2018 | [1] | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | [1] | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Premiums Written: |  |  |  |  |  |  |  |  |  |  |
Direct |  |  |  |  |  |  |  |  | $ 2,890,633 | $ 2,733,459 | $ 2,577,259
Assumed |  |  |  |  |  |  |  |  | 26,250 | 26,685 | 28,779
Ceded premiums written |  |  |  |  |  |  |  |  | (402,597) | (389,503) | (368,750)
Net |  |  |  |  |  |  |  |  | 2,514,286 | 2,370,641 | 2,237,288
Premiums Earned: |  |  |  |  |  |  |  |  |  |  |
Direct |  |  |  |  |  |  |  |  | 2,808,764 | 2,647,488 | 2,484,715
Assumed |  |  |  |  |  |  |  |  | 25,831 | 25,831 | 28,214
Ceded premiums earned |  |  |  |  |  |  |  |  | (398,366) | (382,292) | (363,357)
Total Net Premiums Earned | $ 625,288 | $ 614,277 | $ 604,836 | $ 591,828 | $ 590,088 | $ 572,055 | $ 568,030 | $ 560,854 | 2,436,229 | 2,291,027 | 2,149,572
Loss and loss expense incurred: |  |  |  |  |  |  |  |  |  |  |
Direct |  |  |  |  |  |  |  |  | 1,706,951 | 1,570,678 | 1,560,356
Assumed |  |  |  |  |  |  |  |  | 21,469 | 17,588 | 22,708
Ceded loss and loss expense |  |  |  |  |  |  |  |  | (230,286) | (243,192) | (348,267)
Net |  |  |  |  |  |  |  |  | $ 1,498,134 | $ 1,345,074 | $ 1,234,797
[1] | Results for the fourth quarter of 2017 include the impact of the $20.2 million write off of deferred tax assets required with the implementation of Tax Reform. See Note 13. "Federal Income Taxes" above for additional information.

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