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Schedule IV Reinsurance (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Life insurance in force |  |  |
Gross Amount | $ 17,564,270 | $ 17,025,125 | $ 16,504,539
Ceded to Other Companies | 4,295,412 | 4,065,449 | 3,625,946
Assumed from Other Companies | 0 | 0 | 0
Net Amount | $ 13,268,858 | $ 12,959,676 | $ 12,878,593
Percentage of Amount Assumed to Net | 0.00% | 0.00% | 0.00%
Premiums |  |  |
Gross Amount | $ 812,099 | $ 777,651 | $ 752,798
Ceded to Other Companies | 22,036 | 22,826 | 25,077
Assumed from Other Companies | 4,640 | 4,321 | 4,159
Net Amount | $ 794,703 | $ 759,146 | $ 731,880
Percentage of Amount Assumed to Net | 0.60% | 0.60% | 0.60%
Property and Casualty |  |  |
Premiums |  |  |
Gross Amount | $ 658,960 | $ 632,372 | $ 610,347
Ceded to Other Companies | 15,337 | 16,179 | 18,548
Assumed from Other Companies | 4,640 | 4,321 | 4,159
Net Amount | $ 648,263 | $ 620,514 | $ 595,958
Percentage of Amount Assumed to Net | 0.70% | 0.70% | 0.70%
Retirement |  |  |
Premiums |  |  |
Gross Amount | $ 28,003 | $ 24,937 | $ 25,378
Ceded to Other Companies | 0 | 0 | 0
Assumed from Other Companies | 0 | 0 | 0
Net Amount | $ 28,003 | $ 24,937 | $ 25,378
Percentage of Amount Assumed to Net | 0.00% | 0.00% | 0.00%
Life |  |  |
Premiums |  |  |
Gross Amount | $ 125,136 | $ 120,342 | $ 117,073
Ceded to Other Companies | 6,699 | 6,647 | 6,529
Assumed from Other Companies | 0 | 0 | 0
Net Amount | $ 118,437 | $ 113,695 | $ 110,544
Percentage of Amount Assumed to Net | 0.00% | 0.00% | 0.00%

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