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Schedule IV - Reinsurance (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
Direct Amount |  |  |  |  |  |  |  |  | $ 2,484,715 | $ 2,330,267 | $ 2,183,258
Assumed From Other Companies |  |  |  |  |  |  |  |  | 28,214 | 23,209 | 34,653
Ceded to Other Companies |  |  |  |  |  |  |  |  | 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
Percentage of Amount Assumed to Net |  |  |  |  |  |  |  |  | 1.00% | 1.00% | 2.00%
Accident and Health Insurance Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Direct Amount |  |  |  |  |  |  |  |  | $ 32 | $ 37 | $ 44
Assumed From Other Companies |  |  |  |  |  |  |  |  | 0 | 0 | 0
Ceded to Other Companies |  |  |  |  |  |  |  |  | 0 | 37 | 44
Total Net Premiums Earned |  |  |  |  |  |  |  |  | $ 32 | $ 0 | $ 0
Percentage of Amount Assumed to Net |  |  |  |  |  |  |  |  | 0.00% | 0.00% | 0.00%
Property and liability insurance [Member] |  |  |  |  |  |  |  |  |  |  |
Direct Amount |  |  |  |  |  |  |  |  | $ 2,484,683 | $ 2,330,230 | $ 2,183,214
Assumed From Other Companies |  |  |  |  |  |  |  |  | 28,214 | 23,209 | 34,653
Ceded to Other Companies |  |  |  |  |  |  |  |  | 363,357 | 363,530 | 365,258
Total Net Premiums Earned |  |  |  |  |  |  |  |  | $ 2,149,540 | $ 1,989,909 | $ 1,852,609
Percentage of Amount Assumed to Net |  |  |  |  |  |  |  |  | 1.00% | 1.00% | 2.00%

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