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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, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Premiums Written: |  |  |  |  |  |  |  |  |  |  |
Direct |  |  |  |  |  |  |  |  | $ 2,733,459 | $ 2,577,259 | $ 2,403,519
Assumed |  |  |  |  |  |  |  |  | 26,685 | 28,779 | 23,848
Ceded premiums written |  |  |  |  |  |  |  |  | (389,503) | (368,750) | (357,463)
Net |  |  |  |  |  |  |  |  | 2,370,641 | 2,237,288 | 2,069,904
Premiums Earned: |  |  |  |  |  |  |  |  |  |  |
Direct |  |  |  |  |  |  |  |  | 2,647,488 | 2,484,715 | 2,330,267
Assumed |  |  |  |  |  |  |  |  | 25,831 | 28,214 | 23,209
Ceded premiums earned |  |  |  |  |  |  |  |  | (382,292) | (363,357) | (363,567)
Total Net Premiums Earned | $ 590,088 | $ 572,055 | $ 568,030 | $ 560,854 | $ 552,753 | $ 542,429 | $ 531,932 | $ 522,458 | 2,291,027 | 2,149,572 | 1,989,909
Loss and loss expense incurred: |  |  |  |  |  |  |  |  |  |  |
Direct |  |  |  |  |  |  |  |  | 1,570,678 | 1,560,356 | 1,274,872
Assumed |  |  |  |  |  |  |  |  | 17,588 | 22,708 | 16,996
Ceded loss and loss expense |  |  |  |  |  |  |  |  | (243,192) | (348,267) | (143,327)
Net |  |  |  |  |  |  |  |  | $ 1,345,074 | $ 1,234,797 | $ 1,148,541

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