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Schedule III - Supplementary Insurance Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Supplementary Insurance Information, by Segment [Line Items] |  |  |
Deferred policy acquisition costs | $ 2,133,920 | $ 1,951,892 |
Liability for future policy benefits, losses, claims and loss expense reserves | 6,168,157 | 5,954,524 |
Unearned and advance premiums | 15,587 | 15,423 |
Other policyholders' funds | 313,862 | 307,401 |
Separate account liabilities | 2,195,501 | 2,572,872 |
Premium revenue | 1,085,940 | 961,338 | $ 843,709
Net investment income | 81,430 | 79,017 | 79,025
Benefits, claims, losses and settlement expense | 457,583 | 416,019 | 367,655
Amortization of deferred policy acquisition costs | 239,730 | 209,399 | 180,582
Other operating expense | 786,446 | 684,164 | 633,252
Premiums written | 792 | 821 | 844
Term Life Insurance [Member] |  |  |
Supplementary Insurance Information, by Segment [Line Items] |  |  |
Deferred policy acquisition costs | 2,052,176 | 1,861,253 |
Liability for future policy benefits, losses, claims and loss expense reserves | 5,963,707 | 5,747,317 |
Unearned and advance premiums | 15,016 | 14,795 |
Other policyholders' funds | 303,866 | 299,265 |
Premium revenue | 1,067,079 | 941,057 | 822,207
Net investment income | 13,747 | 9,931 | 7,634
Benefits, claims, losses and settlement expense | 441,775 | 398,212 | 350,640
Amortization of deferred policy acquisition costs | 228,613 | 201,751 | 172,812
Other operating expense | 170,908 | 146,604 | 129,569
Investment and Savings Products [Member] |  |  |
Supplementary Insurance Information, by Segment [Line Items] |  |  |
Deferred policy acquisition costs | 56,548 | 64,419 |
Separate account liabilities | 2,195,409 | 2,572,766 |
Amortization of deferred policy acquisition costs | 9,766 | 6,168 | 6,148
Other operating expense | 471,398 | 403,743 | 374,117
Corporate and Other Distributed Products Segment [Member] |  |  |
Supplementary Insurance Information, by Segment [Line Items] |  |  |
Deferred policy acquisition costs | 25,196 | 26,220 |
Liability for future policy benefits, losses, claims and loss expense reserves | 204,450 | 207,207 |
Unearned and advance premiums | 571 | 628 |
Other policyholders' funds | 9,996 | 8,136 |
Separate account liabilities | 92 | 106 |
Premium revenue | 18,861 | 20,281 | 21,502
Net investment income | 67,683 | 69,086 | 71,391
Benefits, claims, losses and settlement expense | 15,808 | 17,807 | 17,015
Amortization of deferred policy acquisition costs | 1,351 | 1,480 | 1,622
Other operating expense | 144,140 | 133,817 | 129,566
Premiums written | $ 792 | $ 821 | $ 844

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