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Schedule IV - Reinsurance (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
Direct Amount |  |  |  |  |  |  |  |  | $ 2,647,488 | $ 2,484,715 | $ 2,330,267
Assumed From Other Companies |  |  |  |  |  |  |  |  | 25,831 | 28,214 | 23,209
Ceded to Other Companies |  |  |  |  |  |  |  |  | 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
Percentage of Amount Assumed to Net |  |  |  |  |  |  |  |  | 1.00% | 1.00% | 1.00%
Accident and Health Insurance Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Direct Amount |  |  |  |  |  |  |  |  | $ 24 | $ 32 | $ 37
Assumed From Other Companies |  |  |  |  |  |  |  |  | 0 | 0 | 0
Ceded to Other Companies |  |  |  |  |  |  |  |  | 24 | 0 | 37
Total Net Premiums Earned |  |  |  |  |  |  |  |  | $ 0 | $ 32 | $ 0
Percentage of Amount Assumed to Net |  |  |  |  |  |  |  |  | 0.00% | 0.00% | 0.00%
Property and liability insurance [Member] |  |  |  |  |  |  |  |  |  |  |
Direct Amount |  |  |  |  |  |  |  |  | $ 2,647,464 | $ 2,484,683 | $ 2,330,230
Assumed From Other Companies |  |  |  |  |  |  |  |  | 25,831 | 28,214 | 23,209
Ceded to Other Companies |  |  |  |  |  |  |  |  | 382,268 | 363,357 | 363,530
Total Net Premiums Earned |  |  |  |  |  |  |  |  | $ 2,291,027 | $ 2,149,540 | $ 1,989,909
Percentage of Amount Assumed to Net |  |  |  |  |  |  |  |  | 1.00% | 1.00% | 1.00%

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