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Schedule IV - Reinsurance (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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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
Direct Amount |  |  |  |  |  |  |  |  | $ 2,808,764 | $ 2,647,488 | $ 2,484,715
Assumed From Other Companies |  |  |  |  |  |  |  |  | 25,831 | 25,831 | 28,214
Ceded to Other Companies |  |  |  |  |  |  |  |  | 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
Percentage of Amount Assumed to Net |  |  |  |  |  |  |  |  | 1.00% | 1.00% | 1.00%
Accident and Health Insurance Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Direct Amount |  |  |  |  |  |  |  |  | $ 19 | $ 24 | $ 32
Assumed From Other Companies |  |  |  |  |  |  |  |  | 0 | 0 | 0
Ceded to Other Companies |  |  |  |  |  |  |  |  | 19 | 24 | 0
Total Net Premiums Earned |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 32
Percentage of Amount Assumed to Net |  |  |  |  |  |  |  |  | 0.00% | 0.00% | 0.00%
Property and liability insurance [Member] |  |  |  |  |  |  |  |  |  |  |
Direct Amount |  |  |  |  |  |  |  |  | $ 2,808,745 | $ 2,647,464 | $ 2,484,683
Assumed From Other Companies |  |  |  |  |  |  |  |  | 25,831 | 25,831 | 28,214
Ceded to Other Companies |  |  |  |  |  |  |  |  | 398,347 | 382,268 | 363,357
Total Net Premiums Earned |  |  |  |  |  |  |  |  | $ 2,436,229 | $ 2,291,027 | $ 2,149,540
Percentage of Amount Assumed to Net |  |  |  |  |  |  |  |  | 1.00% | 1.00% | 1.00%
[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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- Definition Amount of earned premiums assumed from other entities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(1)) -URI http://asc.fasb.org/extlink&oid=114873790&loc=SL114874131-224263 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17(Column D)) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574992-122915 + Details
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